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  • Dan D'agostino Momentum  S250

    Dan D'agostino Momentum S250

    Dan D'agostino Momentum S250 silver, retail $35000 The Momentum S250 stereo amplifier delivers the extraordinary sound quality of the Momentum M400 monoblock in a more affordable stereo design. The circuit topology and construction of the stereo amplifier mirror those of the monoblock, using the same ultra-efficient copper heat sinks with venturi cooling, the same 1% metal-film resistors, the same 69 MHz output transistors and the same fully complementary balanced configuration. The result is audio fidelity equaled by no other amplifier—except, of course, the Momentum M400 monoblock itself—and an efficient design that consumes less than 1 watt of power at standby. The new Momentum S250 stereo amplifier receives a power upgrade, now delivering 250 Watts/channel into 8 Ohms. This is up from the original 200 Watt/channel specification. A 20% increase in transformer size, up to 1,800VA, provides the engine for this output power increase. Connected to this larger power source is a new output stage design that includes a number of major enhancements. The driver section underwent a major revision and now features a fully complementary signal path with individual transistors employed for the positive and negative halves of the musical signal. Current drive is nearly doubled which feeds a new output stage with an open loop gain increased by the same factor of two. The sound is more spacious, delicate, and dynamic. The distinctive power meter from the monoblock makes an encore appearance in the stereo amplifier, with a separate indicator needle for each channel. Like the monoblock, the stereo amplifier uses through-hole construction and is hand-built and individually tested in D'Agostino's Arizona facility. The Momentum S250 employs the same chassis as the original with a small aesthetic design change to the copper feature on the faceplate sides. Additionally, the meter now displays a scale appropriate for the greater power output. Learn More

  • Meitner STR50

    Meitner STR50

    Meitner STR50 , audio bargain, reviewer owned, original box/packing Power Output - 50 W RMS into 8 Ohms. Frequency Response - 0.1 to 100 KHz. (-3 dB) THD - 20 Hz to 20 KHz - 0.25% at full rated power. Slew Rate - 75 V/uS. Input Impedance - 22 K Ohms shunted by 30 pF. Damping Factor - 100:1 at 1 KHz. Peak Output Current - 10 Amps. Learn More

  • Mark Levinson 33 set of monoblock amplifiers

    Mark Levinson 33 set of monoblock amplifiers

    King of the HIll! one owner These were top of the line for Mark Levinson and will drive any speaker. These are one owner 120V units and have the original factory crates. set is in excellent condition. The Nº33 Reference Mono Power Amplifier uniquely combines extraordinary power delivery with effortless control and unparalleled refinement. Rated at 2,400W continuous into 1-ohm loads, it is the most powerful high-end amplifier in the world. The Nº33 incorporates two 2.45 kVA low noise toroidal transformers in a fully balanced power supply. In this design, there is a separate power supply (each with its own power transformer) for both the inverting and non-inverting halves of the amplifier. Twelve 39,000 μF low ESR capacitors are used in each amplifier. The power supply of each Nº33 provides almost 1⁄2 a Farad of capacitance and 1200 Joules of energy storage. Heavy oxygen-free copper bus bars enhance the efficiency of power distribution within the amplifier and eliminate variances introduced by the wiring harnesses, etc. more commonly found even in high performance amplifiers. High frequency power supply bypass is accomplished on individual PC boards by a total of 56 components of several film types. The resulting uniformly low power supply impedance seen by the various circuits within the Nº33 lays the foundation for both the massive power and the extraordinary finesse that characterizes this amplifier Learn More

  • Cello Encore 50 monos

    Cello Encore 50 monos

    Low fedex rates to the world, very musical, we can ship this in any voltage. Just recapped 1/17. This matched serial number 0161 pair has two aftermarket gold chassis tuning dots on each (from Combak in the picture) that can simply be removed by peeling them off with your fingernail For the more technically inclined, the Encore amplifiers utilize a dual monolithic J-FET input stage and two pairs of 250 watt, metal case, bipolar output devices per channel to produce a whopping 500 watts per channel into 8 ohm load. The principle reason for choosing these devices was, "they [bipolar devices] remain stable with a less complex circuit, requiring less negative feedback and are easier to match to each other than other possible choices for this stage. ‘ As with the original amplifier, the Encore amplifier borrows the Performance's original driver boards that are updated with modern parts. 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

  • Bryston 4B Pro

    Bryston 4B Pro

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

  • Bryston 6b

    Bryston 6b

    Bryston 6b just in, good condition. three available price is for each these are the high powered older ones... Rated distortion: less than .02% I.M. or THD from 20-20 KHz at rated power or below. Rated power: 500 watts 8 ohms 800 watts 4 ohms 500 watts 2 ohms 800 watts 1 ohm 6400 cm2 of heat sinking, etc. 19" X 5.25" X 13.5", 50 lbs. Learn More

  • Spectral DMA 180

    Spectral DMA 180

    200 watt/channel SPECIFICATIONS DMA-180 Stereo Power Amplifier Power Output: (continuous) @ 8 ohms - 200 Watts RMS @ 4 ohms - 400 Watts RMS @ 2 ohms - 683 Watts RMS Output Current: 60 Amps peak per channel Frequency Response: ±0.1 dB, DC-150 KHz ±1 dB, DC-1 MHz ±3 dB, DC-1.8 MHz Distortion: Static: Less than 0.015% from DC to 100 KHz Typically 0.009% @ 200 WRMS/8 ohms Dynamic: 8 Tone Cluster Test 20 KHz @ 500 Hz separation; 0.01% 8 ohms; 0.015% 4 ohms Speed: Rise Time: Less than 400 nanoseconds Settling: 1.5 microseconds to -40dB Slew Rate: 600 volts/microsecond Noise: Signal to Noise: 97dB unweighted, 107dB ASA A Crosstalk: 98dB @ full power 8 ohms Input: Impedence: 100K ohms in parallel with 100 pf Sensitivity: 1.5 volts/nominal output Power Supply: Line Voltage: 100 volts, 120 volts, 240 volts (internal wiring) AC Voltage Range: ±10% Maximum Consumption: 1600 Watts Quiescent Consumption: 250 Watts Operating Temp: 0° to 50° Celsius range; 32° to 122° Farenheit Protection Features: DC Protection Servo: 0.5 volt range Current Limit Onset: 40 Amps Thermal Protect Threshold: 85° Celsius, 185° Farenheit AC Main Fuses: 2 @ 4A 3AG slo-blo, for 100 - 120 VAC, 2 @ 2A 3AG slo-blo, for 220 - 240 VAC Fuse Status: LED indicator (2) Size and Weight: Dimensions: 48cm (19")W x 17cm (6 1/4")H x 48cm (19")D Weight: 60 lbs, 27.2 KG Net Learn More

  • KRELL KSA100S power amplifier

    KRELL KSA100S power amplifier

    KRELL KSA100S power amplifier 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). 100lb shipping weight Learn More

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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

  • Krell FPB 200c

    Krell FPB 200c

    Krell FPB200C, excellent mechanical condition, very nice cosmetics The Full Power Balanced 200c Stereo Power Amplifier is designed for the audiophile who wants the ultimate sound quality from a stereo amplifier with power capabilities of 200 Watts per channel into 8 Ohm, 400 Watts per channel into 4 Ohm, and 800 Watts per channel into 2 Ohm loudspeaker loads. - Fully balanced circuitry from input to output insures signal integrity, rejects noise, and improves signal-to-noise ratios to deliver a ""night and day"" sonic difference when compared to typical single-ended circuitry. - Computer regulated power supply provides consistent sound quality at wide dynamic range regardless of fluctuating line voltages. - Current mode operation ensures wide bandwidth and accurate harmonic reproduction for lifelike sound reproduction. - Class A operation to full rated output redistributes minor distortion by-products and delivers clear transient sounds and harmonically correct overtones. - Proprietary Krell output and driver transistors assure substantial output current capability. Learn More

  • Cello Performance Four Chassis Mono Amplifiers

    Cello Performance Four Chassis Mono Amplifiers

    Still one of the better amps out there. Four chassis. We have replaced all the large capacitors with new Chemicons and some of the signal caps also. Product Specifications: Class of operation: Class AB1 Power Output (single amp): @8 Ohms Rated: 200 Watts Clipping: @1000 Hz >350 Watts @4 Ohms Rated: 400 Watts Clipping: @1000 Hz >700 Watts @2 Ohms Rated: 800 Watts Clipping: @1000 Hz >1000 Watts @1 Ohm Rated: 1000 Watts Clipping: @1000 Hz >1300 Watts Power Output (bridged set): @8 Ohms Rated: 800 Watts Clipping: @1000 Hz >1400 Watts @4 Ohms Rated: 1600 Watts Clipping: @1000 Hz >2800 Watts @2 Ohms Rated: 3200 Watts Clipping: @1000 Hz >4000 Watts IMD (SMPTE): 0.13% (60 Hz / 40V Output) IMD (CCIF): <0.2% THD (20 - 20000Hz): <0.1% (8 & 4 Ohms / 40 Volt Output) Frequency Response: +0 / -0.8 dB @ 20 - 20000 Hz Dynamic Headroom: 2.7 dB Channel Separation: Infinite Signal to Noise: < -105 dB (1000 Hz / 40 Volt Output) Input Sensitivity: 1.485 V (8 Ohms / 200 Watts / 40 Volt Output) Input Impedance: 1 mOhm (Non-Inverting) 5000 Ohms (Inverting) Learn More

  • 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

  • Lamm M1.1 Mono Amplifiers used

    Lamm M1.1 Mono Amplifiers used

    Lamm M1.1 Mono Amplifiers, original factory crates price is per pair, two pairs available Learn More

  • 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

  • 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

  • Spectral DMA250 spoken for, inquire

    Spectral DMA250 spoken for, inquire

    Spectral DMA250, used factory carton, I can voltage convert prior to shipping. INQUIRE IF STILL AVAILABLE BEFORE PURCHASING. http://www.spectralaudio.com/dma-250.htm SPECIFICATIONS DMA-250 Stereo Power Amplifier Power Output: (continuous) @ 8 ohms - 200 Watts RMS @ 4 ohms - 350 Watts RMS @ 2 ohms - 570 Watts RMS Output Current: 60 Amps peak per channel Frequency Response: ±0.1 dB, DC-150 KHz ±1 dB, DC-1 MHz ±3 dB, DC-1.8 MHz Distortion: Static: Less than 0.015% from DC to 100 KHz, typically 0.009% @ 200 WRMS/8 ohms Dynamic: 8 Tone Cluster Test 20 KHz @ 500 Hz separation; 0.01% 8 ohms; 0.015% 4 ohms Speed: Rise Time: Less than 400 nanoseconds Settling: 1.5 microseconds to -40dB Slew Rate: 600 volts/microsecond Noise: Signal to Noise: 97dB unweighted, 107dB ASA A Crosstalk: 98dB @ full power 8 ohms Input: Impedence: 100K ohms in parallel with 100 pf Sensitivity: 1.5 volts/nominal output Power Supply: Line Voltage: 100 volts, 120 volts, 240 volts (factory set) AC Voltage Range: ±10% Maximum Consumption: 1600 Watts Quiescent Consumption: 250 Watts Operating Temp: 0° to 50° Celsius range; 32° to 122° Farenheit Protection Features: DC Protection Servo: 0.5 volt range Current Limit Onset: 60 Amps Thermal Threshold: Protects at 85° Celsius, 185° Farenheit AC Main Fuses: 2 @ 2-1/2A 3 AG slo-blo, for 100 - 120 VAC 2 @ 1-1/4A 3AG slo-blo, for 220-240 VAC Size and Weight: Dimensions: 48.22cm (19")W x 18.4cm (7 1/4")H x 45.8cm (18")D Weight: 62 lbs, 28.1 KG Net Learn More

  • 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

  • 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

  • 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

  • Krell S275  in BLACK

    Krell S275 in BLACK

    Krell S275 retail price is $5500 US, we can ship this in any voltage. These have never been sold to a consumer. 4 available price is for each black unit The S-275 is a flexible design boasting 275 watts/channel in stereo mode. A switch on the rear panel converts the S-275 to a 550 watt mono amplifier. The S-275 is a half wide design allowing two amplifiers to fit in the same space as a normal sized amplifier. In that same space, five S-150m amplifiers can reside as they are only 3.4" wide. FREQUENCY RESPONSE 20 Hz–20 kHz +0 dB, -0.08 dB - Stereo +0 dB, -0.12 dB - Mono SIGNAL-TO-NOISE RATIO “A” weighted 115 dB TOTAL HARMONIC DISTORTION (THD) 1 kHz <0.03% 20 kHz <0.20% GAIN Selectable, 25.8 or 19.8 dB - stereo Selectable, 31.8 or 25.8 dB - mono INPUT SENSITIVITY Selectable, 2.4 V or 4.8 V - stereo Selectable, 1.7 V or 3.4 V - mono INPUT IMPEDANCE 20 kOhms single-ended 20 kOhms balanced OUTPUT IMPEDANCE <0.067 Ohms - stereo <.15 Ohms - mono POWER CONSUMPTION Idle 80 W - stereo, 65 W mono Max. 1,900 W TRANSFORMER 1,650 VA INPUTS 1 pair balanced via XLR connectors Learn More

  • 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

  • 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

  • Krell 450mcx single mono

    Krell 450mcx single mono

    Krell 450mcx single mono just fully serviced. (this is a factory upgraded 350mc) six month warranty Learn More

  • 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

  • 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

  • Cello HTA-3  3 channel amplifier

    Cello HTA-3 3 channel amplifier

    Cello HTA-3 channel amplifier 200 watts / channel x 3 channels, rare Learn More

  • Hafler DH220

    Hafler DH220

    Hafler DH220, only one left for sale 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

  • 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

  • ASR Emitter II Exclusive 4 chassis integrated amplifier

    ASR Emitter II Exclusive 4 chassis integrated amplifier

    ASR Emitter ii Exclusive with gold heatsink option Description: Solid-state, multi-chassis, integrated amplifier with remote control. Maximum output power: 280Wpc into 8 ohms (24.5dBW), 500Wpc into 4 ohms (24dBW), 900Wpc into 2 ohms (23.5dBW), 1400Wpc into 1 ohm (22.4dBW). Frequency response: 0.2Hz–500kHz, –3dB. Distortion: <0.02%, 50mW to 1dB under maximum RMS output at 1kHz; <0.1%, 20Hz–20kHz. Input impedance: 10k ohms. Input sensitivity (for 150W into 8 ohms): level "61," 2.0V; level "76," 400mV. Voltage Gain: up to 28dB in position 1, up to 43dB in position 2, depending on volume setting. Signal/Noise Ratio: >90dB ref. 1W/8 ohms. Dimensions: Amplifier: 22.4" (570mm) W by 9.1" (230mm) H by 17.3" (440mm) D. Weight: 103 lbs (47kg). Two power supplies (each): 16.9" (430mm) W by 5.9" (150mm) H by 15.6" (400mm) D. Weight: 70.6 lbs (32kg). Battery pack: 16.9" (430mm) W by 5.9" (150mm) H by 15.6" (400mm) D. Weight: 57.3 lbs (26kg). original four boxes with packing, just recapped and ready to go (not the 56 filter caps, no need to change those) six month warranty THIS SOUNDS SPECTACULAR! Learn More

  • Cello Duet 350 stereo

    Cello Duet 350 stereo

    Cello Duet 350 stereo, bench tested Owner's manual: http://www.matthew-james.net/Customer-Content/WWW/CMS/files/Duet-350-Owners.pdf Learn More

  • Krell (all models)

    Krell (all models)

    We are authorized dealers for all Krell products. Please inquire about any product. Learn More

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