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  • Adcom GFA5300

    Adcom GFA5300

    Adcom GFA5300 bench tested, works properly Learn More
    $175.00

  • Marantz MA500

    Marantz MA500

    Marantz MA500 Treat your family and guests to quality entertainment by using the Marantz MA-500 1 Channel Power Mono Amplifier. This unit is compact enough to be functional and stylish in practically any spot in a room. Able to deliver 125 watts into 8 ohms, this product is ideal for powering just about any speaker. In fact, it can create a new multi-channel home theater or provide an additional channel for amplifiers to an existing system. An RC-5 remote control also makes it possible for users to change settings without getting up from the comfort of their seats. This black amp weighs a mere 13.2 pounds, which makes it possible for users to move it easily from one spot to another. They measure 19 inches in depth by 3.5 inches in width by 6 inches in height.This Monoblock equipment is specifically designed for use in home theaters and surround-sound system setups. The 125-watt and 180-watt performance delivers high power into 8-ohm loads, ensuring that users don't lose signals even in challenging audio environments. A frequency response between 10 and 100K combines with a signal-to-noise ratio of less than 116 decibels, making it a practical choice for beginners who want a high-tech music solution that can easily synchronize with a variety of music systems and accessories. The product can be bridged at 8 ohms for a total of 360 watts.This isn’t just a reliable product for home theater and small professional setups. The amp also boasts an excellent reputation for its support for home computers, car subwoofers, speakers, and other accessories. In fact, these amps will never run out of breath. Marantz MA-500 1 Channel Power Amplifier can really provide a lot of RMS power. Buyers should not rule out flexible integration of these capable products because they can offer a pleasing experience when properly paired and tuned.This product delivers the kind of performance enthusiasts expect from the highest-end amp. It has plenty of reserve energy even when hooked up with some of the most modern speakers and receivers. As for performance, the sound quality will endure even at lows as low as 20 hertz. In addition, it will continue to show clear and precise mids and highs almost every time. Even non-audiophiles are likely to be impressed by the clear sound and amazing bass response. This is the kind of performance that’s sure to keep you on your toes. That’s particularly true when hooked up to phono preamplifier or even ma-9s2 block amps, receivers, advance stereo headphones, and other monoblock gear.Overall, the durability and audio quality of MA500 is sure to serve you well now, and even as audio technology advances. This is a great choice for casual listeners, audiophiles, and even professionals who want reliable equipment, small size, and high output. This is a sublime amplifier design that should satisfy even the most demanding listener. Product Identifiers Brand Marantz Learn More
    $188.00

  • Rotel RB-1050

    Rotel RB-1050

    Rotel RB-1050 Ideal for demanding custom installations, the ultrastable RB-1050 combines audiophile sound quality and “bullet-proof” circuitry. A multi-mode amplifier, the RB-1050 develops 70 watts per channel for stereo reproduction. Individual sensitivity adjustments and “auto on” signal sensing circuitry allows use with a variety of distribution devices or processors. Buffered line level outputs allow multiple amplifiers to “daisy chain” from a single source. The toroid-based power supply and high damping factor ensure precise control of virtually all speakers. 12 volt “trigger” jacks and a detachable AC cord make this amplifier ideal for remote operated distributed audio systems. A front panel LED array shows clipping and protection modes for quick system analysis. Power Configurations: 2 x 70 watts Watts/Channel: all channels driven, unbridged, 8 ohm load, 20 to 20k Hz, 0.06% THD 70 watts THD (20-20,000Hz): cont. rated power one-half rated power one watt per channel 0.03%, maximum 0.03%, maximum 0.03%, maximum IM Distortion (at rated ower, 60Hz:7kHz = 4:1): 0.03%, maximum Damping Factor (8 ohms): 500 Input Sens. / Impedance: 1.0V / 33 kohms Frequency Response: 10-100kHz (±1dB) S/N Ratio (IHF A): 116dB Power Consumption: 250 watts Dimensions (W x H x D): 433 x 92 x 334mm 17 1/8 x 3 5/8 x 13 1/8" Front Panel Height: 80 mm, 3.1" Learn More
    $285.00

  • Hafler DH220

    Hafler DH220

    Hafler DH220, two available. The DH-220 circuit is a refinement of the DH-200 design, a Hafler landmark which has achieved worldwide recognition, and has elicited glowing reviews since its 1979 introduction. As in the DH-110 preamplifier, particular attention has been paid to component quality, using polypropylene or film capacitors wherever feasible, for example, for superior sound. Combining the latest power MOSFET technology with uniquely simple and effective circuit topology reduces distortion of all types, and at all power levels, over the full audio frequency spectrum, to the vanishing point. Specifications Power output: 115 watts per channel into 8Ω (stereo) Frequency response: 6Hz to 60kHz Total harmonic distortion: 0.02% Damping factor: 60 Input sensitivity: 1.55V Signal to noise ratio: 100dB Semiconductors: 26 x transistors, 8 x MOSfet, 29 x diodes, 4 x zener diodes, 1 x diode bridge Dimensions: 5-1/8 x 16 x 10-1/2 inches Weight: 26lbs Learn More
    $290.00

  • Boston Acoustics SA1 140 watt subwoofer amplifier

    Boston Acoustics SA1 140 watt subwoofer amplifier

    Subwoofer amplifier with built in crossover $600 retail http://www.bostonacoustics.com/US/Product/Pages/ProductDetail.aspx?CatId=HomeAudio(BostonAcoustics_US)&SubCatId=Accessories(BostonAcoustics_US)&Pid=SA1(BostonAcoustics) Learn More
    $300.00

  • Linn LK85 (2 available, price is for each)

    Linn LK85 (2 available, price is for each)

    Linn LK85 This model of Stereo Power Amplifier operates at 85W per channel up to 4 Ohms. The Linn amplifier is fully upgradeable, so users can update it when other components of their stereo systems are upgraded. There are four sets of speaker wiring on the Linn LK85, which makes bi-cabling convenient to put in place. The Linn amplifier is designed to conserve energy by going into sleep mode after 10 minutes of inactivity. This feature also preserves the circuitry, which can become damaged from frequently turning it on and off. The Stereo Power Amplifier is all black and is often referred to as the Black Box. There are no frills, and the basic look of the Linn LK85 allows it to go along with many other components of the stereo system without looking out of place. Key Features RMS Power at 4 Ohms x2 85 W RMS Power at 8 Ohms 62 W 115V Learn More
    $325.00

  • Emotiva XPA-100

    Emotiva XPA-100

    Emotiva XPA-100 used original box Audiophile monoblock (one channel) amplifier; 400 watts @ 4 Ohms; 250 watts @ 8 Ohms Fully discrete signal path, with class A/B output stage and massive power reserves Balanced and unbalanced inputs; dual full-sized speaker outputs to facilitate bi-wiring Microprocessor operating system with full fault protection and status indicators Low profile 2RU chassis lets you fit five XPA-100s in a single rack. Learn More
    $350.00

  • Definitive Audio SubAmp 600  sold

    Definitive Audio SubAmp 600 sold

    Definitive Audio SubAmp 600 in good condition sold Outboard amplifier for Definitive (or other) in-wall subwoofers Drives either one or two subwoofers Volume, Low-pass crossover and phase adjustments Five-way binding post speaker connectors The SubAmp 600 is a high powered amplifier and electronic crossover specifically engineered for use with the Definitive IWSub 10/10 and IWSub References in-wall subwoofers. It features two discrete high power amplifiers with simple connections in one convenient housing that fits easily on a shelf or in an audio equipment rack. It provides optimal power for effortlessly driving one or two IWSubs, in the same room or in different zones. It also provides crossover functions for the system and level, low-pass crossover frequency and phase can all be adjusted with convenient front-panel control knobs. http://www.definitivetech.com/products/subamp-600 Learn More
    $350.00

  • Kinergetics Subwoofer amplifier
    $380.00

  • Sonographe SA150 by Conrad Johnson

    Sonographe SA150 by Conrad Johnson

    Sonographe SA150 by Conrad Johnson Was $1000 retail, matching preamp available. Very musical Learn More
    $390.00

  • Krell Trigger Converter 12pin in to 5 pin out

    Krell Trigger Converter 12pin in to 5 pin out

    Krell Trigger Converter 12pin in to 5 pin out Learn More
    $399.00

  • Adcom GFA-555

    Adcom GFA-555

    Adcom GFA-555 just upgraded Learn More
    $450.00

  • Acurus A250

    Acurus A250

    Acurus A250 I used to sell these new back in the day. An excellent , musical entry level amplifier, Much better than an Adcom 555, smooth sounding, not bright Power output: 250 watts per channel into 8Ω (stereo) Frequency response: 20Hz to 20kHz Total harmonic distortion: 0.06% Input sensitivity: 1.2V Signal to noise ratio: 110dB Learn More
    $450.00

  • Crown PS-400 power amplifier

    Crown PS-400 power amplifier

    Power output: 165 watts per channel into 8Ω (stereo), 530W into 8Ω (mono) Frequency response: 1Hz to 20kHz Total harmonic distortion: 0.05% Damping factor: 400 Gain: 26.3 dB Input sensitivity: 1.76V Speaker load impedance: 4Ω to 8Ω Dimensions: 483 x 178 x 257mm Weight: 24.9kg Learn More
    $450.00

  • AnthemMCA2MKII

    AnthemMCA2MKII

    I can convert voltage if needed.. 200 watts/channel high end sound owners manual: http://archive.anthemav.com/oldsitev1/pdf/mcalit.pdf Learn More
    $550.00

  • Emotiva XPA-2

    Emotiva XPA-2

    Emotiva XPA-2 Modular channel design for greater channel separation. Automatic 120/230 AC voltage detection and switching. Multi segment bar graph output level meters with clip detect. Metering and status LED on/off switches. Fully protected from all fault conditions. Soft start circuitry. Advanced microprocessor operating system. External trigger turn on. Soft touch power switch. 4RU chassis w/ solid 15mm milled aluminum faceplate. IEC power inlet. Output topology: discrete triple Darlington with On Semi output devices. Input topology: dual differential input. Input: balanced (XLR) and unbalanced (RCA), switchable. Output: audiophile quality 5 way binding posts. Display type: digital status indicators. XPA-2 2 Channel Audio Power Amplifier 250 watts RMS x 2 into 8 ohms, 500 watts RMS x 2 into 4 ohms Learn More
    $550.00

  • Nakamichi PA5

    Nakamichi PA5

    Classic 80's Nelson Pass designed Power output: 100 watts per channel into 8Ω (stereo) Frequency response: 7Hz to 150kHz Total harmonic distortion: 0.1% Damping factor: 60 Input sensitivity: 1.4V Signal to noise ratio: 120dB Speaker load impedance: 4Ω to 16Ω Semiconductors: 20 x transistors Dimensions: 435 x 135 x 368mm Weight: 16kg Learn More
    $550.00

  • Quad 606 amplifier

    Quad 606 amplifier

    The Quad 606 Power Amplifier is another classic amplifier design from Quad utilising their patented current dumping technology. Essentially a current dumping circuit like the Quad 606 Power Amplifier consists of a very high quality low power class A amplifier feeding a high power low quality amplifier which is used when required. The Quad 606 Power Amplifier was originally launched in 1987 and essentially was a new improved version of Quad's 405 amplifier with extra oomph and a whopping 140 watts per channel into 8 ohms whose sonic improvement compared to original Quad 405-2 was significant. The Quad 606 Power Amplifier was also very popular with professional audio people as well as audiophiles possibly because of the sheer power of this amplifier coupled with Quad's reputation for producing solid well built amplifiers. The Quad 606 Power Amplifier was discontinued in 1997 to make way for the Quad 707 power amplifier which was another current dumping design that improved slightly on the Quad 606 and was one of Hi-Fi World's recommended amplifiers at that time. Learn More
    $560.00

  • Tandberg 3006 amplifier

    Tandberg 3006 amplifier

    Tandberg 3006 amplifier bench tested, works great, excellent condtion with side panels Power output: 150 watts per channel into 8Ω (stereo) Frequency response: 20Hz to 20kHz Total harmonic distortion: 0.05% Damping factor: 200 Signal to noise ratio: 94dB Dimensions: 435 x 350 x 83mm Weight: 11.3kg Learn More
    $600.00

  • Kenwood LO7 monoblocks

    Kenwood LO7 monoblocks

    classics \Power output: 150W into 8Ω (mono) Frequency response: 1Hz to 50kHz Total harmonic distortion: 0.008% Damping factor: 100 Input sensitivity: 1V Signal to noise ratio: 120dB Speaker load impedance: 4Ω to 16Ω Dimensions: 200 x 155 x 390mm Weight: 13kg Learn More
    $650.00

  • Adcom GFA5500

    Adcom GFA5500

    Adcom GFA5500, very good cosmetics. bench tested Learn More
    $650.00

  • Classe CA-101 power amplifier

    Classe CA-101 power amplifier

    Power output: 100 watts per channel into 8Ω (stereo), 350W into 8Ω (mono) Frequency response: 20Hz to 20kHz Classe CA-101 power amplifier Total harmonic distortion: 0.03% Gain: 29.02 dB Input sensitivity: 0.95V Signal to noise ratio: 128dB Speaker load impedance: 4Ω (minimum) Dimensions: 482.6 x 362 x 139.7mm Weight: 15.45kg Learn More
    $749.00

  • Bryston 4b

    Bryston 4b

    In fair condition.. some scratches Description: Solid-state stereo power amplifier. Output power: 250W continuous into 8 ohms (24dBW), 400Wpc rms continuous into 4 ohms (23dBW); 800W continuous into 8 ohms in bridged mode (29dBW). Current delivery: 16A continuous, 48A peak, per channel. Frequency response: 1Hz–100kHz, ±3dB for 1W output. S/N Ratio: hum and noise, 108dB below rated output, 90dB IHF. Input sensitivity: 1.4V for 250Wpc into 8 ohms. Voltage gain: 30dB. THD+noise: 20Hz–20kHz, 0.01%. IM distortion (60Hz+7kHz, 4:1, SMPTE method): less than 0.01% at rated power. Damping factor: greater than 500 at 20Hz, at 8 ohms (equivalent to an output impedance of less than 0.016 ohms). Input impedance: 50k ohms unbalanced, 30k ohms balanced. Polarity: non-inverting. Dimensions: 16 3/16" (411mm) W by 7 1/8" (181mm) H by 13½" (343mm) D. Weight: 40.1 lbs (20.2kg) net. Learn More
    $750.00

  • Dynaco Stereo 120 (3) and PAT 4 preamp

    Dynaco Stereo 120 (3) and PAT 4 preamp

    You can purchase each item individually. We have one 120 that we just replaced the coupling caps and resoldered the board as needed. That's $250 Inquire The Dynaco Stereo 120 is an all silicon transistor basic power amplifier for use with separate preamplifiers such as the Dynaco PAT-4 or PAT-5, or for use with tape recorders or tuners such as the FM-5 or AF-6, which have their own volume controls. The unit contains two 60 watt amplifiers on one chassis with a common power supply. Although the Stereo 120 is a solid state device, containing transistors and similar semiconductors, it has been designed to be used under normal conditions without special safety precautions, just as if it were a high grade tube amplifier. Thus it can be connected to source and speaker components and used with confidence in all conventional arrangements. There are no circuit breakers, speaker fuses, or other resettable devices to impede the use of the Stereo 120 under any reasonable conditions of use or abuse. This is achieved by using novel circuits (on which patents are pending) which automatically and instantly protect the amplifier. Specifications Power output: 60 watts per channel into 8Ω (stereo) Frequency response: 5Hz to 100kHz Total harmonic distortion: 0.5% Damping factor: 40 Input sensitivity: 1.5V Signal to noise ratio: 95dB Speaker load impedance: 4Ω to 16Ω Semiconductors: 15 x transistors, 15 x diodes Dimensions: 13 x 10.5 x 4 inches Weight: 20lbs Learn More
    $770.00

  • Mcintosh MC250

    Mcintosh MC250

    Mcintosh MC250 nice condition Mclntosh audio power ratings are in accordance with the Federal Trade Commission Regulation of November 4, 1974 concerning power output claims for amplifiers used in home entertainment products. POWER OUTPUT STEREO 50 watts minimum sine wave continuous average power output, per channel, both channels operating into 4 ohms, 8 ohms, or 16 ohms load impedance, which is: 14.1 volts RMS across 4 ohms 20.0 volts RMS across 8 ohms 28.3 volts RMS across 16 ohms MONO 100 watts minimum sine wave continuous average power output, operating into 2 ohms, 4 ohms, or 8 ohms load impedance, which is: 14.1 volts RMS across 2 ohms 20.0 volts RMS across 4 ohms 28.3 volts RMS across 8 ohms OUTPUT LOAD IMPEDANCE STEREO 4 ohms, 8 ohms, or 16 ohms; separate terminals are provided for each output MONO 2 ohms, 4 ohms, or 8 ohms; separate terminals are provided for each output RATED POWER BAND 20 Hz to 20,000 Hz TOTAL HARMONIC DISTORTION STEREO 0.25% maximum harmonic distortion at any power level from 250 milliwatts to 50 watts per channel from 20 Hz to 20,000 Hz, both channels operating MONO 0.25% maximum harmonic distortion at any power level from 250 milliwatts to 100 watts from 20 Hz to 20,000 Hz INTERMODULATION DISTORTION STEREO 0.25% if instantaneous peak power output is 100 watts or less per channel with both channels operating for any combination of frequencies 20 Hz to 20,000 Hz MONO 0.25% if instantaneous peak power output is 200 watts or less for any combination of frequencies 20 Hz to 20,000 Hz FREQUENCY RESPONSE (at 1 watt output) 20 Hz to 20,000 Hz +0 -0.25 dB 10 Hz to 100,000 Hz +0 -3.0 dB NOISE AND HUM 90 dB below rated output RATINGS OUTPUT VOLTAGES Stereo and Mono 25 volts for distribution lines DAMPING FACTOR 15 at 3 ohms output 38 at 8 ohms output 17 at 16 ohms output INPUT IMPEDANCE 200,00 Ohms INPUT SENSITIVITY 0.5 volt. Level control provided for higher input voltage GENERAL INFORMATION POWER REQUIREMENTS 120 volts, 50/60 Hz, 50 watts at zero signal output, 250 watts at rated output SEMICONDUCTOR COMPLEMENT 24 silicon transistors 18 silicon rectifiers and diodes MECHANICAL INFORMATION SIZE 7 1/16 inches high (17.94 cm), 105 /8 inches wide (26.99 cm), 155 /8 inches deep (39.69 cm) CHASSIS Chrome and black WEIGHT 36 pounds (16 Vintage Amplifier 50w/ch stereo. 100w mono. Response 20-20kHz (+0 -0.25dB). Learn More
    $800.00

  • Bryston 3bTHX

    Bryston 3bTHX

    12volt on off trigger Description: Solid-state stereo power amplifier. Output power: 120W continuous into 8 ohms (20.8dBW), 200Wpc continuous into 4 ohms (20dBW); 400W continuous into 8 ohms in bridged mode (26dBW). Distortion: 0.007% at 120W, 20Hz-20kHz, IM (60Hz+7kHz, 4:1, SMPTE method) or THD. S/N ratio: 106dB ref. rated output, 90dB IHF. Slew rate: >60V/µs. Damping factor: >500 at 20Hz ref. 8 ohms, equivalent to an output impedance of 0.016 ohms. Input sensitivity: 1V for 120Wpc into 8 ohms; 2V for full output, balanced. Input impedance: 50k ohms unbalanced, 20k ohms balanced. Polarity: non-inverting. Dimensions: 19" (482.5mm) W by 5.25" (133mm) H by 9" (228mm) D. Weight: 22 lbs (10kg). Learn More
    $850.00

  • Sumo Andromeda II

    Sumo Andromeda II

    Sumo Andromeda II Mint, our tech just went through this and readjusting dc offset, bias 2/17 Learn More
    $850.00

  • Nakamichi PA7

    Nakamichi PA7

    Nelson Pass designed, classic top of the line unit Completely recapped except 4 main big filters. (they are in great condition and rarely need recapping) The PA-7 delivers 200 watts per channel, uses no overall negative feedback (a Pass trademark), and boasts the Stasis section, which consists of a low-power voltage amplifier coupled to the current mirror bootstrap output stage to do all the heavy lifting required for high-power output. As a single-ended amplifier, the PA-7’s rear panel is sparse, with a pair of RCA input jacks, an IEC socket for your power cord of choice—little did Nakamichi engineers know that in the 21st century, power cords would cost much more than the original price of the PA-7)—and relatively standard binding posts for speaker output Learn More
    $950.00

  • Krell KAV-150a slim line stereo amplifier

    Krell KAV-150a slim line stereo amplifier

    We currently have two of these amplifiers, price is for each KAV-150a. They can be run as mono at 600w/ channel if you have two. Owner's manual: http://krellonline.com/assets/support/KAV150a_V980_MAN.pdf Specifications FREQUENCY RESPONSE 20 Hz-20 kHz +0.0, -0.1 dB .5 Hz-150 kHz +0.0, -3.0 dB OUTPUT POWER, each channel driven 8 Ohms 600 W (bridged) 8 Ohms 150 W SIGNAL TO NOISE RATIO 112 dB, "A" weighted DISTORTION 1 kHz 0.06% THD 20 kHz 0.25% THD GAIN 25.8 dB INPUT SENSITIVITY 1.8 Vrms INPUT IMPENDENCE 100K Ohms OUTPUT VOLTAGE Peak to peak RMS 116V 41 V 4 Ohms 300 W POWER CONSUMPTION Idle 40 W Max. 600 W DIMENSIONS 19w x 3.7h x 15.5d in. 47.5w x 9.25h x 38.75d cm WEIGHT Shipped Unit only 33 Ibs., 14.9 kg 25 Ibs., 1 1.4 kg Learn More
    $999.00

  • Rotel RB-1091

    Rotel RB-1091

    500 watt top of line Only one available.... manual http://www.rotel.com/content/reviews/class%20d%20amplifiers/rb1091-hifinews-ma As new in the original boxes The absolute sound review: http://www.avguide.com/review/rotel-rb-1091-monoblock-amplifier This incredible new Class D amplifier from Rotel is based upon the same ICEpower® technology as utilized in the RMB-1077. The principal difference between the two being that RB-1091 produces a prodigious 500 watts mono into 8 ohms from a 3 5/8" high chassis. Rotel’s new Class D amplifiers are incredibly powerful and stable and will provide increasing amounts of voltage and current down to 4 ohm loads. Manufacturer: Rotel Part Number: RB1091 Specification: Power Configurations (FTC): 1x500 Watts Total Harmonic Distortion (20Hz-20KHz, 8 Ohms): < 0.03% Output Peak Current: 40A Damping Factor (8 Ohms): 400 Frequency Response: 10-40 KHz (±3dB) Signal to Noise Ratio (IHF A): 118 db Learn More
    $999.00

  • Bryston 4B Pro

    Bryston 4B Pro

    checked up at factory last year, with xlr jacks 250watt/channel well reviewed Learn More
    $999.00

  • Bryston 6b

    Bryston 6b

    Bryston 6b just in, good condition. three available price is for each a three-channel powerhouse capable of 250 watts/channel into an 8-ohm load or a whopping 400 watts into 4. The 6B-ST is actually a rack-mountable chassis housing three fully modular mono power amps, each with its own independent power supply with over 40,000 MFD of filter capacitance. This design not only improves the 6B's reliability, but also reduces interchannel crosstalk to vanishingly low levels. Only a soft-start AC circuit is shared by the three channels, each of which has its own indicator LED. Two 6B-STs will provide all the power needed for a full-range surround system. A pair can also be used to bi-amp or tri-amp high-performance stereo loudspeakers. Each amplifier module features a three-position gain switch for balanced or unbalanced inputs, and a polarity switch to make speaker-to-speaker phase alignment easy. A remote 12-volt trigger allows the amp to be switched on or off by a similarly equipped preamp. The Bryston 6B-measures 19" W (standard rack mount black faceplate) x 19" D x 7" H and weighs 85lbs. A silver faceplate is available as an option, as is a 17" version without handles. Like all Bryston products, the 6B-ST carries a 20-year warranty. Learn More
    $1,000.00

  • Mcintosh MC7100

    Mcintosh MC7100

    Mcintosh MC7100 100 watts/channel 2 available (you can bridge them to 300watts/channel) PERFORMANCE LIMITS Performance limits are the maximum deviation from perfection permitted for a Mclntosh instrument. We promise you that when you purchase a new MC7100 from a Mclntosh Franchised Dealer, it will be capable of performance at or better than these limits. STEREO POWER OUTPUT 150 watts into 4 ohm loads or 100 watts into 8 ohm loads minimum sine wave continuous average power output per channel, both channels operating. The output RMS voltage is: 28.3V across 8 ohms 24.5V across 4 ohms MONOPHONIC (BRIDGED) 300 watts into an 8 ohm load minimum sine wave continuous average power output. The output RMS voltage is: 49 volts across 8 ohms. OUTPUT LOAD IMPEDANCE STEREO 8 or 4 ohms MONOPHONIC 8 ohms RATED POWER BAND 20Hz to 20,000Hz TOTAL HARMONIC DISTORTION 0.005% maximum harmonic distortion at any power level from 250 milliwatts to rated power output. IHF DYNAMIC HEADROOM 8 ohms, 1.7dB 4 ohms, 2.1dB FREQUENCY RESPONSE + 0, -0.25dB from 20Hz to 20.000Hz + 0, -3.0dB from 10Hz to 100,000Hz INPUT SENSITIVITY 1.4 volts (2.5 volts at gain control center detent) A-WEIGHTED SIGNAL-TO-NOISE RATIO 95dB (115dB below rated output) INTERMODULATION DISTORTION. SMPTE 0.005% maximum if instantaneous peak power output does not exceed twice the output power rating. RATINGS WIDE BAND DAMPING FACTOR 8 ohms, 200 4 ohms, 100 INPUT IMPEDANCE 20,000 ohms POWER GUARD Clipping is prevented and THD does not exceed 2% with up to 14dB overdrive at 1000Hz. POWER REQUIREMENTS 120 volts, 50/60HZ, 3.0 amps UL/CSA MECHANICAL SIZE Front panel: 17 1/2 inches (44.5cm) wide, by 3 5/8 inches (9.2cm) high. Chassis: 14 3/4 inches (37.5cm) wide, by 2 3/8 inches (6cm) high, by 14 1/2 inches (36.9cm) deep, (from back of front panel), including connectors. Panel clearance required in front of the mounting surface is 1 inch (2.54cm). FINISH Glass with special gold/teal nomenclature illumination. Chassis and chassis cover are black. WEIGHT 24 pounds (11 Kg) net; 35 pounds (15.9Kg) Only 3 5/8 high Learn More
    $1,150.00

  • Krell KAV-250a

    Krell KAV-250a

    Krell KAV-250a, more than one available 250watts/channel http://krellonline.com/assets/support/KAV250A3_V992_MAN.pdf http://www.soundandvision.com/content/krell-industries-kav-250a-and-kav-250a3 \two channels driving 8-ohm loads, began clipping at 0.038% distortion and 207.4 watts. The amp reaches 0.1% distortion at 233.2 watts and 1% distortion at 294.8 watts, as shown above. Into 4 ohms, the amp begins clipping at 407.9 watts and reaches 0.1% distortion at 427.3 watts and 1% distortion at 498.7 watts. The amplifier's frequency response was +/-0.16 decibels from 20 hertz to 20 kilohertz. The response only dropped to -0.04 dB at 10 Hz and to -0.88 dB at 50 kHz. Crosstalk was -102.5 dB from left to right at 1 kHz and -97.2 dB from right to left at 1 kHz. THD+N from the amplifier was less than 0.023% at 1 kHz Learn More
    $1,300.00

  • Audio Research D52B

    Audio Research D52B

    solid state amplifier, unused in over 20 years, very nice condition, tech checked 11/16 50 watts per channel minimum RMS (both channels operating) at 8 ohms from 1 Hz to 20 kHz with less than .25% total harmonic distortion. Typically less than .02% at rated power in midband. Approximate actual power available per channel at "clipping" (both ch. op.): 80 (4 ohms), 60 (8 ohms), 35 (16 ohms) Power bandwidth Frequency response 0.05 Hz to 100 Khz (-3 db) Input sensitivity 1.1 Volts RMS for rated power and load. Input impedance 30 Kohms (nominal). Output taps Output regulation Overall negative feedback Damping factor More than 500 at rated power and load (20 Hz to 20 kHz). (Effective internal impedance approximately .012 ohms.) Distortion Intermodulation distortion: Less than .1% at rated output (56.56 V p to p) and load (SMPTE method). THD and IMD both decrease with decreasing output. Slew rate Rise time Hum & noise Wide-band, unweighted, more than 90 dB below 50 watts at 8 ohms - power line components (hum) more than 80 dB below 50 watts at 8 ohms. Power supply energy storage Power requirements 105-120/210-240 VAC, 50/60 Hz, 600 watts maximum. 120 watts at idle. 300 watts at rated power. Other Dimensions 19" (48 cm) W x 5 ¼" (13 cm) H (standard rack mount panel size) x 10 ½ (26.7 cm) D (front panel back). Handles extend 1 ½" (3.8 cm) forward of the front panel. Weight 39 lbs. (17.7 kg) Net, 45 lbs. (20.5 kg) Shipping Learn More
    $1,300.00

  • Mark Levinson ML11

    Mark Levinson ML11

    Mark Levinson ML11 power amplifier . With its 2 x 50W in a small enclosure with the heat sinks hidden inside makes it look shy, but it's not. It another great amplifier of MLAS which is perfect as an all-purpose home hifi amplifier. As the others he can drive almost any load. Specifications Power output: 2 x 50W. Weight: 11Kg Maximum power : 260W. Learn More
    $1,480.00

  • PS Audio Stellar S350   CALL FOR PRICE!  TRADE-IN'S ACCEPTED

    PS Audio Stellar S350 CALL FOR PRICE! TRADE-IN'S ACCEPTED

    PS Audio Stellar S350 CALL FOR PRICE! TRADE-IN'S ACCEPTED Learn More

  • PS Audio Stellar M700 mono amplifier  CALL FOR PRICE!  TRADE-IN'S ACCEPTED

    PS Audio Stellar M700 mono amplifier CALL FOR PRICE! TRADE-IN'S ACCEPTED

    PS Audio Stellar M700 mono amplifier CALL FOR PRICE! TRADE-IN'S ACCEPTED The Stellar M700 mono amplifiers are a massively powerful engine capable of effortlessly driving demanding loudspeaker loads to concert levels. Stellar’s best. A pair of these placed on any loudspeaker brings forth the lush, rich and soul-satisfying power of two completely independent power blocks with headroom to spare. One listen to a hugely loud and complex musical passage effortlessly rendered by the M700 pair and you’ll know you made the right choice. Rated at 350 Watts into 8Ω and 700 Watts into 4Ω, the M700 combines the best of two worlds: ultra linear, high-current, Class D technology for the output stage; a discrete, Class A MOSFET based Analog Cell for the all-important input stage. The M700’s rich, warm, and engaging sonic character comes from the Analog Cell. Its powerful, authoritative control over the loudspeaker stems from its high current, ultra-low impedance Class D output stage. Stellar’s design imperative was to produce a truly musical sounding power amplifier that proudly competed with any amplifier under $5,000. Its designer, PS Audio engineer Darren Myers, took the challenge and set to work on a new concept—a hybrid that would combine the best of today’s technology with time-honored techniques leveraging PS Audio’s forty plus years of experience. The results are extraordinarily musical. Even from the earliest prototype we knew the Stellar power amplifier series was going to be something special. Stellar amplifiers never draw attention to themselves, a rare quality in amplifiers of any price. After hundreds of hours of tuning, voicing, and perfectionist tweaking, we were confident the ends justified the means. Audition the Stellar M700 pair and you’ll appreciate Myer’s dedication to musical truth without compromise. Learn More

  • Krell KST100 recapped in black

    Krell KST100 recapped in black

    Krell KST100 recapped for you 2/17 and the other 6/17 0 hours since recap owner's manual: http://www.krellonline.com/assets/support/KST100_MAN.pdf six month parts and labor warranty KST-100 GAIN 26dB, SIGNAL-TO-NOISE 102dB unweighted THD 1K at 8 ohms less than. 1% 20K at 8 ohms less than .3% INPUT IMPEDANCE 47,000 ohms(47K) INPUT SENSITIVITY 1.5 volts for 100 watts out OUTPUT IMPEDANCE ¯ 1 ohms OUTPUT VOLTAGE 80 volts peak to peak 8 ohms OUTPUT POWER All readings are continuous output power, per channel ohms 100 watts ohms 200 watts ohms 400 watts ohm 800 watts DIMENSIONS 18.0" WIDE 14.8" DEEP with handles 6.5" HIGH with feet SHIPPING WEIGHT 60 pounds Learn More
    $1,560.00

  • Krell KSA 100s

    Krell KSA 100s

    Description: Power output: 100W into 8 ohms (20dBW), doubles with each halving of load impedance down to 1 ohm. Frequency response: 20Hz–20kHz, +0.0/– .1dB; 1Hz–150kHz, +0.0/–3dB. Distortion: <0.1% at 1kHz; <0.5%, 20kHz, full power. Slew rate: 100V/µs. Input sensitivity: 1.4V RMS. Gain: 26dB. Damping factor: >60. Input impedance: 47k ohms. Power consumption: 100W, idle; 1400W, full power. Dimensions: 19" W by 8.5" H by 19.25" D. Weight: 80 lbs (net). Learn More
    $1,800.00

  • Mcintosh 2205 new restoration from original owner.

    Mcintosh 2205 new restoration from original owner.

    Mcintosh 2205 just recapped We are currently restoring two examples of the 2205 and a single 2015 amplifier right now. New caps, lubrication, bulbs,etc. Original owner on all. Power output: 200 watts per channel into 8Ω (stereo), 400W into 8Ω (mono) Frequency response: 10Hz to 100kHz Total harmonic distortion: 0.1% Damping factor: 16 Input sensitivity: 0.75V Signal to noise ratio: 95dB Speaker load impedance: 1Ω to 8Ω Learn More
    $1,999.00

  • Krell KAV-2250 in black or silver, recapped

    Krell KAV-2250 in black or silver, recapped

    Krell KAV-2250 in black, original box/packing, very nice cosmetics... Specifications KAV –2250 FREQUENCY 20 Hz to 20 kHz +0 dB, -0.09 dB RESPONSE 0.25 Hz to 170 kHz +0 dB, -3 dB SIGNAL TO NOISE RATIO “A” WEIGHTED >112 dB TOTAL HARMONIC 1 kHz < 0.03% DISTORTION (THD) 20 kHz < 0.20% GAIN 25.7 dB INPUT IMPEDANCE 100 kOhms INPUT SENSITIVITY 2.32 Vrms OUTPUT VOLTAGE Peak to Peak 127 V RMS 45 V OUTPUT POWER EACH CHANNEL 8 Ohms 250 W 4 Ohms 500 W BRIDGED 8 Ohms 1000 W POWER Standby 35 W CONSUMPTION Idle 80 W Max. 2000 W INPUTS 2 single-ended via RCA connectors 2 balanced via XLR connectors OUTPUTS 2 amplifier channels via five-way binding posts REMOTE CONNECTORS 12 VDC Out (12 V trigger) via a 3.5 mm connector 12 VDC In (12 V trigger) via a 3.5 mm connector DIMENSIONS 17.3w x 5.6h x 17.1d in. 43.8w x 14.3h x 43.4d cm WEIGHT SHIPPING 74.0 lb., 33.5 kg UNIT ONLY 64.0 lb., 29.0 kg All operational features, functions, specifications, and policies are subject to change without notification. Learn More
    $1,999.00

  • Krell KSA150 recapped

    Krell KSA150 recapped

    Krell KSA150 classic Krell amplifier, Great amp to get into high end audio with. 90 days parts and labor warranty The latest generation of high-resolution source components and speakers places new demands on the power amplifier. The Krell KSA 150 and KSA-250 meet these challenges with fresh design sophistication and long-term value. Both products can drive any speaker with an effortless quality that makes their power seem endless. Extreme clarity is maintained at all power levels. They both utilize Krell refined high-bias Class A and direct-coupled circuitry from input to output. Their power supplies and output stages are massive. High voltage rails with extensive regulation are provided for the input circuitry. All materials and electronic components are of the finest quality and operate within their optimum performance ranges. Virtually all hand wiring has been eliminated, resulting in a dramatic improvement in sonic clarity. The KSA-150 and KSA-250 both utilize Class A circuitry throughout the audio and power supply regulation stages. Class A gain stages deliver excellent sonic performance under diverse conditions because all active components are turned on at all times. This allows each component to operate in its most linear and precise regions. The amplifiers are able to respond to the full range of input signals with equal accuracy. The KSA-150 and the KSA-250 are conservatively rated at 150 and 250 watts per channel into 8 ohms, respectively. The 150 will actually generate 220 watts into 8 ohms, and the 250 will generate 320 watts into 8 ohms. The 8-ohm power ratings do not account for the amplifiers superb sonic performance nor describe their maximum power. The Krell definition of power and the ability to drive low impedances is that the output must double into successively low impedances. The immense power supplies in both products allow them to double their power into one ohm. There are many advances in thermal construction and control circuitry in the KSA -150 and KSA -250. All heat bearing structural components and external heat sinks have been designed in-house to improve thermal tracking and cooling. This construction provides very low thermal resistance between the output transistors and the heat sinks, resulting in superior thermal tracking. It also results in a considerable reduction in overall size. Greater amplifier life expectancy is an added design benefit. Automatic self-adjusting bias and DC offset control circuitry have been developed for the KSA-150 and the KSA-250. These circuits compel the amplifiers to conform to their intended operational parameters under all AC mains conditions. Learn More
    $2,099.00

  • Krell KSA100 MK II

    Krell KSA100 MK II

    Krell KSA100 MK II excellent cosmetics, there are some green markings in the picture which were removed. We can ship this in your desired voltage Description provided by highendclassics.com: The Krell KSA-100 Class A poweramplifier was the first stereo amplifier from Krell Audio Industries. At the start of the eighties Connecticut witnessed the birth of another highend audio company within its stateborders: Krell Industies. ‘Class A power to the people’ could have been one of the inspiring thoughts for Daniel D’Agostino chief designer of Krell Industries. Of course there were already some Class A designs in the domain of the power amplifier but most and probably all of them were confined to relatively small powerratings. Even the huge monaural Class A amplifier from Levinson, the ML-2’s, could only muster 30 to 40 Watts of power at 8 Ohms. Other noteworthy low power Class A designs were John Bedini’s 25/25 Class A amp and Jean Hiraga’s ‘Hiraga Classe A’. The only high power Class A amp in those days was a stereo 125 Watt Class A design from the SUMO electric company named ‘The Gold’ designed by James Bongiorno. D’Agostino envisioned and designed an array of high powered Class A amps in which the KSA-100 (abbreviation KSA stands for Krell Stereo Amplifier) was the most powerful stereo amplifier rated at 100 Watts Class A power at 8 Ohms. Technical The KSA-100 is a configuration of two completely separated amps only sharing the same huge chassis. Each amp has its own powersupply (one Avel Lindberg 1250 VA toroidal, two 40,000 uF Sprague or Mallory large cans per channel), driverboard and poweroutputsection. Another so called true dual mono design was the ML-3 from Levinson but this amp was biased in AB mode. To get rid of all the Class A generated heat from the outputsection Krell opted for forced cooling with Papst fans blowing down (the MK II version blew upwards in sync with the natural convection flow of heat) trough circular arranged heatsinks with eight TO3 encased powertransistors per channel attached to it. As a matter of fact the ‘The Gold’ from the SUMO company also used fans to cool down the amp. Using active cooling instead of natural convection kept size and cost in check because huge expansive heatsinks would be needed to drop off the 650 Watts continuous power consumption. Seven years later Krell did make huge convection cooled mono-amps as their reference series (KRS-100 & KRS-200) with the same Class A output but with a significant raise in price and weight compared to the forced cooled versions. Although Krell has always been strongly associated with Class A biasing it’s their ability to drive extremely tough loads, like the renowned amplifier killer the Apogee Scintilla (1 Ohm version) fullrange ribbonspeaker, that really illustrated the kind of DNA a Krell was made of. Only a few other amplifiers in this era, and most of them were amps with low powerratings, could drive speakers at such low impedences. Opening up the “hood ” of the amp gives you a strong visual indication of the ‘brute force’ method used to get an unflappable amp that could drive anything on the market then and today. D’Agostino’s assault on the highend poweramplifier market was very successful worldwide due to these first designs. After Levinson and Threshold, Krell established itself as a strong contender on the highend audio-market. Sound quality This range of first Krell designs redefined the meaning of bass-slam. The KSA-100 sounded much more powerful then it’s relatively modest rating of 100 Watts with acceptable levels of refinement in the middle and high regions of the frequency-spectrum. This stereo-amp is a alround workhouse that was often mated with tube preamplifiers from Audio-Research and Conrad Johnson. Not delicacy and transparancy as the best offerings from Levinson and Threshold but nevertheless highly recommend. Krell KSA-100 Type: 100 Watt class-A stereo power amplifier Introduction: 1981 Discontinued:1987 Power rating (manufacturer) 8 Ohms 100 Watt 4 Ohms 200 Watt 2 Ohms 400 Watt 1 Ohm 800 Watt 0.5 Ohm 1200 Watt Learn More
    $2,100.00

  • Conrad Johnson MF2500

    Conrad Johnson MF2500

    Conrad Johnson MF2500 used, very nice condition with original box/pac ki ng We can ship this in your desired voltage Like many Conrad-Johnson designs, the MF2500's higher performance goals have been attained through experience and the refinement of established circuits, not by some magic new topology that's claimed to solve all previously known audio-fidelity problems. Thus the input stage is a standard differential circuit executed with FETs. The second stage comprises a buffered voltage-gain amplifier, and uses bipolar transistors. It drives a regular class-A/B push-pull bipolar output stage, which is direct-coupled to the speaker. The output stage is run at quite a low idle power, which partly explains why the amplifier takes a little time to get up to speed from a cold start (footnote 1). But it does mean that the amplifier does not run too hot to touch. While some of the MF2500's technology is derived from the older MF2300A (reviewed in October 1996), the big change has been from FET to bipolar output devices. In this circuit, at least, bipolars confer greater gain stability with output load and current variations, imparting a more consistent and more dynamic sound quality. The MF2500 has high-current, resin-encapsulated Sanken power transistors: two 2SC3281 and two SA1302 devices are paralleled for each channel's output stage. These transistors have good thermal properties, high-quality electrical connections to their junctions, and are endowed with good safe-operating areas. This means the amplifier can be protected with simple quick-blow fuses. C-J favors a predominantly low-order distortion spectrum in which some second harmonic is designed to dominate the distortion residual, this in the MF2500 courtesy of the input FETs. Minimal loop negative feedback is used, in this case just 12.5dB, or approximately 4x. (Some amplifiers may run with x1000 to x10,000 of feedback.) As Lew Johnson explained, "the more the performance of the basic circuits was improved from the new MF series, the more important was the upgrading of individual component quality. Then negative feedback could be reduced yet again." The MF2500's regulation topology is of Premier quality. For example, the input stage has its own transformer tap stabilized at a voltage higher than the output stage requirement. Discrete open-loop regulators have audiophile-grade polystyrene and polypropylene capacitors. Only the main current reservoirs are electrolytic, but here there is no choice. Voltage-reference and feedback-control resistors are costly metal-foil Vishays. Six 10,000µF Nichicon electrolytics form the central reservoirs for both channels, giving a total of 30,000µF per DC supply phase and ensuring good current delivery at low frequencies. The massive EI-lamination transformer has split secondary sections to feed the various regulators. I also counted no fewer than 22 of C-J's exclusive lead-foil, large-value polystyrene capacitors, plus eight higher-value, audiophile-grade polypropylene caps. Hardware The MF2500's 3/8" alloy front panel is anodized in C-J's traditional gold, while the rest is finished in satin-black textured enamel. The baseplate can be removed to access the underside of the printed circuit board. The only control is a front-panel power switch, and there's no soft start. The heavy transformer is affixed to the right side of the chassis, while the single, external, full-size finned heatsink is to the left. The inputs are single-ended phono sockets, the outputs 5-way binding posts, all gold-plated. Thermal protection is via a self-resetting thermal trip circuit. The power cord is a captive three-core type. Listening I found I preferred to leave the MF2500 on most of the time, its low idle power proving a blessing. The amplifier also benefited from extended break-in. In some respects, the MF2500 gave an understated view of musical events—with casual listening it's possible to dismiss it on grounds of a lack of forthrightness for its rather measured pace, and an almost rich, distant presentation. Yet, over the long term, and along with its even-tempered if slightly sweet tonal balance, it was the very absence of a forced or excitable character, false hardness, or excessive attack that endeared the MF2500 to me. There was a sense of ease; aural fatigue was significantly lower than usual for this class of amplifier. Just when I thought I'd got about as much out of the MF2500 as I was going to get, it got better by stages. Elements of this sound—almost a tube experience—had been dimly evident in earlier solid-state amplifiers from C-J. But some of the necessary tonal consistency, fine textures, vitality, and clarity were not expressed well enough to make those models truly viable alternatives. Their FET output stages suffered from some variations in both clarity and tonal color with reproduced sound level, this to some degree also dependent on the loudspeaker load and the program complexity. In the case of the MF2500, two key aspects have become firmly established. First, this amplifier offered the ability to play all the way to full output with consistent quality. Second, while the MF2500 won't put C-J's Premier Eight A monoblocks out of business, or even the smaller Premier Eleven A, its sound conveyed much of the general nature of a fine tube amplifier—a classic type of moderate negative feedback, wide bandwidth, and linear, push-pull design—coupled with greater dynamic range and sheer load-driving grunt. Tonal colors were natural, never strident, thin, or hard. While the bass didn't have the kind of deeply extended impact of the biggest, most costly reference amplifiers, it was satisfying. Not only was the bass powerful—more than sufficient to do justice to cathedral organ at full stretch, and able to carry the low-frequency presence of a large symphony orchestra—it was also articulate, in terms of both detail and tune-playing. The bass also had a kind of bouncy, springy recovery that lent drive and interest to rhythm bass lines on jazz and classic rock. Through the midrange, the MF2500 had a thermionic tonal poise that appeared to have a payoff in terms of natural image depth and perspective. While the amplifier's transparency was rated fairly well, the natural tonality helped create coherent, focused well-layered images. Stage width also rated above average, if a little more like that of a fine moving-coil cartridge than a CD source. In the upper frequencies, the amplifier remained even tempered, well balanced, and even quite delicately resolved. String tone was nicely presented, and no false edge or breathiness was added to vocal sibilants. In fact, vocals in general were handled with near-tubelike quality and good clarity, and the inner harmonies of massed choir were well read, with well-maintained perspectives. Within that slightly "relaxed" temperament, the MF2500 nevertheless managed to pack quite a punch—this is a bighearted amplifier, and sounds it. As it continued to break-in and I grew more familiar with its balance, musical values asserted themselves. Pace, rhythm, and timing, plus dynamic resolution, were all rated significantly above average. On my personal scoring scale, this amplifier achieved a commendable 22 points, a significantly good result for type and price. Conclusion Conrad-Johnson's MF2500 is a successful product on many grounds. It closely approaches the classic tonal character of a fine tubed amplifier—a C-J hallmark—and holds on to that quality over a great range of output power and possible speaker loading. Not easy to accomplish. It also avoids the cheap, quick thrill of a bright, fast, forward sound. Instead, it builds on quality and depth of performance to achieve its commendable rating. Its sound is musically entertaining without being hyperactive, while its broad, bighearted approach is easy on the ears. All kinds of music were handled with equanimity. In the lab, the MF2500's high output power and good load tolerance were confirmed. The amplifier could dump up to 900Wpc into 2 ohm loads for short-term peaks, and cruise happily at around 300Wpc driving 8 ohm loads. This matches the attainment of significantly more costly amplifiers. Except for the modest channel separation at high frequencies, no test result gave rise to concern. Well-built and well-finished, with effective if old-fashioned circuit protection, the MF2500 idled at quite low power and could be safely left on for extended listening periods. This musically well-balanced powerhouse represents fine dollar value, and wins a warm recommendation. Read more at http://www.stereophile.com/solidpoweramps/1299cj/index.html#rBtsA65UcjrOiMpq.99 Learn More
    $2,180.00

  • Mark Levinson 331 stereo amplifier

    Mark Levinson 331 stereo amplifier

    Levinson 331 Description: Solid-state stereo amplifier. Rated output power, 20Hz–20kHz, with no more than 0.5% THD (FTC): 100Wpc minimum continuous into 8 ohms (20dBW); 200Wpc minimum continuous into 4 ohms (20dBW); 400Wpc continuous into 2 ohms (20dBW). Peak output voltage at rated line voltage: 48V into 8 ohms. Frequency response: 20Hz–20kHz ±1dB. S/N ratio (main output): <–80dB (ref. 1W). Input impedance: 100k ohms balanced, 50k ohms single-ended. Voltage gain: 26.8dB. Input sensitivity (for 2.8V output): 130mV. Input sensitivity (for full output): 1.3V. Output impedance: !x0.05 ohms, 20Hz–20kHz. Damping factor: >800, 20Hz–20kHz into 8 ohms. Power consumption: typically 260W at idle, 110W in standby. Dimensions: 17.56" (446mm) W by 18.85" (479mm) D by 9.3" (232mm) H; faceplate curve depth 1.22" (31mm). Shipping weight: 112 lbs Learn More
    $2,200.00

  • Krell Altair

    Krell Altair

    Krell Altair Reference $5500 low profile amplifier with separate power supply from the 1990's. Original boxes Designed as a reference amplifier for apartment sized systems. Power suppy caps just recapped. Learn More
    $2,370.00

  • Balanced Audio Technology VK-6200

    Balanced Audio Technology VK-6200

    Balanced Audio Technology VK-6200 Balanced Audio Technology’s groundbreaking VK-6200 multichannel power amplifier satisfies the demands of the most sophisticated home-theater system while simultaneously playing music with the characteristic open, uncompromised sound that has become a BAT hallmark. Until now, the compromises required to fit several channels of amplification into a single chassis have restricted sound quality—even for high-end components. Competitors’ best designs often require an expensive commitment to buy a “fully loaded” configuration. The VK-6200 is different. Its modular design accommodates up to six discrete 200-watt amplifier modules. Fully balanced, the VK-6200 can also be purchased in any configuration—from two to six channels. Output per channel at 8Ω/4Ω 200W / 400W Conversion to Mono? 2,3,4,5 or 6 channels Output in Mono Configuration 8Ω/4Ω n/a Frequency Response 2Hz to 180kHz THD at full power 0.1% Input Impedance 50 kΩ Gain (Nominal into 8Ω) 23dB Balanced / 29dB Single-Ended Tube Complement n/a Number of Power Cords 1 Remote Control 12V Trigger Input & Output Power Consumption (Idle/Full Power) 80W/1800W (w/ 6 channels) Dimensions (WHD) Inches 19" x 10.5" x 23" Dimensions (WHD) mm 480 x 280 x 580 Weight 100 - 180 Lbs Learn More
    $2,500.00

  • Crown Reference 1

    Crown Reference 1

    Crown Reference 1 ships to you in 6/2017 Reference I (120 V, 60 Hz models) The Crown® Studio Reference I power amplifier shall be a solid-state two-channel model employing multi-mode (AB+B) grounded bridge(TM) output circuitry with a variable impedance (VZ) power supply for each channel. The outputs shall be switchable as stereo, bridged-mono or parallel-mono modes of operation. The bridged-mono mode shall bridge the outputs to provide increased output voltage. The parallel-mono mode shall parallel the outputs to provide increased output current. The output impedance of each channel shall be less than 10 milliohms in series with less than 2 microhenries in stereo mode. The variable impedance power supplies shall reduce unnecessary voltage across the output devices by automatically switching to a parallel mode when less voltage is required by the output circuitry and to a series mode when more voltage is required. The amplifier shall contain protection circuitry which limits the drive level placed on the output devices before their SOA (Safe Operating Area) is exceeded. This protection circuitry shall calculate the instantaneous voltage across and current through the output devices while factoring in their simulated junction temperatures to predict how close they are to their operating limits. This protection will be called “ODEP.” The amplifier shall contain controlled slew-rate voltage circuitry to protect it against radio frequency interference burnouts. It shall also be protected from current overload at its output stage. The slew rate of the amplifier shall be greater than 30 volts per microsecond in stereo mode. The amplifier shall temporarily go into a stand-by mode if its power transformer becomes excessively hot and shall automatically resume normal operation once it has cooled to a safe operating temperature. Front-panel controls shall include an enable on/off switch and a detented input level control for each channel. Rear-mounted controls shall include a ground lift switch to isolate the signal ground from the chassis ground, a switch which selects between stereo, bridged-mono and parallel-mono modes of operation and a reset switch for the AC mains circuit breaker. Internal controls shall include an input sensitivity switch to select between 0.775 V, 1.4 V or a fixed voltage gain of 26 dB for full rated output. A Crown P.I.P. and P.I.P.2-compatible expansion connector shall be provided behind an access panel in the rear to accept auxiliary input modules. It shall be fully compatible with the Crown IQ System. Front panel indicators shall include an amber power enable indicator, an amber ODEP protection system indicator for each channel which shall normally be illuminated to confirm the availability of reserve thermodynamic energy and which shall dim in proportion to limiting when the power demands of the output stages have been exceeded, a green IOC indicator for each channel, and a green Signal indicator for each channel which shall normally flash at moderate intensity to show the presence of an audio signal. The power amplifier shall meet or exceed the following performance criteria. Input sensitivity for rated output: 26 dB voltage gain (unbalanced). Rated FTC output in stereo mode with less than 0.1% THD: 780watts per channel (20 Hz to 20 kHz) into 8 ohms. Hum and noise: at least 120 dB (A weighted) below full rated output power. Phase response: +5 to –15 degrees from 20 Hz to 20 kHz at 1 watt. Frequency response: 20 Hz to 20 kHz, 0.1 dB at 1 watt into 8 ohms per channel in stereo mode. Damping factor: greater than 20,000 from 10 to 200 Hz into 8 ohms. Intermodulation distortion (SMPTE): less than 0.005% from full bandwidth power to 78 watts rising linearly to better than 70 dB at 20 kHz. Harmonic distortion: less than 0.02% at rated low-distortion 1 kHz power. The amplifier shall be safe when driving any kind of load—even highly reactive ones. The power requirements shall be 120 VAC at 60 Hz. At idle, the amplifier shall draw 90 watts or less. The amplifier chassis shall be constructed of steel with a durable black finish and shall be designed for flow-through fan-assisted ventilation from the front panel to the side panels. The amplifier shall have an aluminum front panel with super-gloss Imron finish and Lexan overlay. The dimensions of the amplifier shall allow for 19 inch (48.3 cm) EIA standard (RS- 310-B) rack mounting. The amplifier shall be 7 inches (17.8 cm) tall, 16 inches (40.6 cm) deep behind the rack-mounting surface, and 2.75 inches (7 cm) in front of the rack-mounting surface. The amplifier shall weigh 60 pounds, 11 ounces (27.6 kg) and shall have a center of gravity approximately 6 inches (15.2 cm) behind the front panel. The amplifier shall be designated the Crown Studio Reference Learn More
    $2,500.00

  • Jeff Rowland Design Group Model 5 (last version)

    Jeff Rowland Design Group Model 5 (last version)

    A classic, musical, large, best example of a Jeff Rowland Design Model 5 stereo amplifier Power Bandwidth 0.15 Hz to 250 kHz, -3 dB. - Slew Rate 75 volts per microsecond. - Damping Factor Greater than 175, 20 Hz to 20 kHz, 8 ohms. - Output Current 40 amps peak, continuous. - Sensitivity 36 mV, 1 watt, 8 ohms. - Input Impedance Selectable: 100k, 20k, 600 ohms. - Power Requirements 100V-240V. Learn More
    $2,500.00

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