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  • 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

  • Conrad Johnson MF200

    Conrad Johnson MF200

    Conrad Johnson MF200 200 watts/channel solid state $2000 when new, great amp, better than the old Aragons, Bryston 4b etc by a lot Learn More
    $999.00

  • 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

  • Parasound JC1 mono amplifiers used

    Parasound JC1 mono amplifiers used

    Parasound JC1 mono amplifiers price is per pair used, like new condition Learn More
    $6,500.00

  • Goldmund A2 modules (original, new gold)

    Goldmund A2 modules (original, new gold)

    Goldmund A2 modules (original, new gold) I purchased these sequential modules from the former Goldmund distributor they are a NOS (new old stock pair) Learn More
    $2,300.00

  • Lexicon 501 same as Bryston 7Bst

    Lexicon 501 same as Bryston 7Bst

    Lexicon 501 same as Bryston 7Bst 500 watts/channel one mono amplifier Learn More
    $1,150.00

  • Goldmund Mimesis 9

    Goldmund Mimesis 9

    Goldmund Mimesis 9 invery nice condition, shipping dimensions: 25x25x16 180 lbs low fedex rates, send your postal code. Goldmund is a Swiss manufacturer that produced highly sought after high end power amplifiers. The Mimesis 9 is considered to be one of the most legendary solid state power amplifiers that they produced. It originally retailed around $14,000. The Mimesis 9 with it Swiss craftsmanship is a true reference amplifier. The Mimesis 9 has deep bass, forward strong sounding mids and crystal clear highs. By design the output for this amp is transformer coupled for a balanced and defined sonic image Learn More
    $3,900.00

  • 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

  • Adcom GFA5500

    Adcom GFA5500

    Adcom GFA5500, very good cosmetics. bench tested Learn More
    $550.00

  • Krell FPB250MC mono pair

    Krell FPB250MC mono pair

    Krell FPB250MC, excellent like new cosmetics Recapped! shipping price will be twice the shipping charge (or less) at online checkout. email for an accurate quote. Power output: 250W into 8Ω (mono) Frequency response: 20Hz to 20kHz Total harmonic distortion: 0.03% Gain: 26.4 dB Input sensitivity: 2.14V Signal to noise ratio: 114dB Dimensions: 318 x 267 x 406mm Weight: 31kg Learn More
    $5,500.00

  • D'agostino Momentum Stereo Amplfiier

    D'agostino Momentum Stereo Amplfiier

    D'agostino Momentum Stereo Amplfiier, mint with case in 9/18 pictures shortly Learn More
    $17,500.00

  • Halcro DM-78

    Halcro DM-78

    Halcro DM-78, one mono amplifier in 9/18, we are in the process of overhauling this one mono amplifier We have repaired Halcro amplifiers before. Learn More
    $5,000.00

  • Bryston 4B ST

    Bryston 4B ST

    with xlr jacks 250watt/channel well reviewed Learn More
    $999.00

  • Krell MDA 500 monos

    Krell MDA 500 monos

    Krell MDA 500 monos , recapped 7/13/18 classic Krell amplifiers, excellent condition, very very late version, they have the metal binding posts class A beasts, they need to be crated and shipped by truck only We can ship internationally in your desired voltage, inquire Learn More
    $5,750.00

  • PS Audio 200C (3 available)

    PS Audio 200C (3 available)

    PS Audio 200C (3 available) just in 7/18 we need to service/upgrade these before shipping Learn More
    $800.00

  • Classe DR25

    Classe DR25

    Classe DR25, in 5/21/18 original box/manual Power output: 250 watts per channel into 8Ω (stereo), 1000W into 8Ω (mono) Frequency response: 20Hz to 20kHz Total harmonic distortion: 0.1% Input sensitivity: 1.6V Signal to noise ratio: 100dB Speaker load impedance: 4Ω (minimum) Dimensions: 19 x 20.75 x 8 inches Weight: 70lbs net Learn More
    $1,900.00

  • Mcintosh MC7150

    Mcintosh MC7150

    Mcintosh MC7150 Form Stereo power amplifier Output stereo: 150W+150W (a sinusoidal consecutive output, load-impedance 2/4/8ohm) Output load impedance stereo: 2 ohms, 4ohm, 8ohm Output frequency band 20Hz - 20kHz THD stereo: 0.005% or less (at the time of 20Hz - 20kHz, 250mW-150W, and both ch(es) drive) Cross modulation distortion (20Hz - 20kHz) stereo: 0.005% or less (It is about the channel of one side at both the less than peek 300W and channel drive time. ) Frequency band (at the time of 1W output) 20Hz - 20kHz, and +0 -0.25 dB 10Hz - 100kHz, and +0 -3.0 dB SN ratio 105dB or less (at the time of an Output power A Wei Ted) Dynamic head room 1.8dB(IHF) Dumping factor 40 or more Input impedance 20kohms (unbalance) Input sensitivity At the time of an input VR center it1: 2.5V At the time of input VR full: 1.4V Power guarding It is less than THD2% to over-drive 14dB at 1kHz. Power source AC100V, 50Hz/60 Hz, 0.5A-7A Dimensions Width 410x height 145x depth of 416mm (termination included) Weight 26.3kg Learn More
    $2,600.00

  • Bryston 6b 500w mono

    Bryston 6b 500w mono

    Bryston 6b 500w mono 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
    $860.00

  • Spectral DMA 180  2 amplifiers available

    Spectral DMA 180 2 amplifiers available

    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
    $2,999.00

  • VTL MB250 mono amplifiers
    $3,000.00

  • Conrad Johnson MF2200

    Conrad Johnson MF2200

    Conrad Johnson MF2200, serviced 9/18 Learn More
    $950.00

  • 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

  • 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
    $1,999.00

  • 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

  • Mcintosh MC7100

    Mcintosh MC7100

    Mcintosh MC7100 100 watts/channel 1available rca inputs (you can bridge them to 300watts/channel) 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
    $1,250.00

  • 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
    $17,200.00

  • 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

  • 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
    $2,600.00

  • 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

  • Cello Performance II  Four Chassis Mono Amplifiers

    Cello Performance II Four Chassis Mono Amplifiers

    Cello Performance II Four Chassis Mono Amplifiers with factory connecting cables for the amps, very rare Inquire for a freight quote Learn More
    $14,800.00

  • 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

  • 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

  • Emerald Physics 100.2 SE

    Emerald Physics 100.2 SE

    Emerald Physics 100.2 SE, excellent condition mono amplifier Learn More
    $600.00

    Out of stock

  • Spectral DMA250 inquire

    Spectral DMA250 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
    $4,400.00

  • D'agostino Classic 2 stereo amplifier

    D'agostino Classic 2 stereo amplifier

    D'agostino Classic 2 stereo amplifier, like new, original box full factory warranty The Classic Stereo is the most cost-effective way to experience the incomparable sound quality of Dan D'Agostino Master Audio Systems. Its core technologies are heavily based on the design of D'Agostino's acclaimed Momentum amplifiers. The sound combines the immense power and current needed to drive even the most exotic speakers with a subtle, sweet musicality normally associated with much smaller amplifiers. With the Classic Stereo, there is no need to worry about finding the right amplifier for your speakers...because the Classic Stereo is the right amplifier, no matter what speakers you own. As its name suggests, the Classic Stereo is a purist stereo amplifier, built into a basic yet attractive and rugged enclosure that can be rack-mounted if you wish. It's the simplest, most affordable way to get true D'Agostino quality: essential two-channel sound, with delicacy and dynamics that will please the world's most sophisticated audiophiles. No frills. Pure performance. Like every product from Dan D'Agostino Master Audio Systems, each Classic Stereo is built by hand in our Arizona factory using robust through-hole construction. * Photographs by Filip Kulpa, Audio-Video Poland Finish Black Power 300 watts @ 8Ω 600 watts @ 4Ω 1,200 watts @ 2Ω Frequency Response 1 Hz to 200 kHz, -1 dB 20Hz to 20 kHz, ±0 dB Distortion < 0.1% at 1 kHz 300 watts/8 ohms Signal-to-Noise Ratio 100 dB, unweighted Inputs 2 balanced XLR (XLR to RCA adapters supplied) Input Impedance 100KΩ Output Impedance 0.12Ω Dimensions 11.5 x 19 x 20 inches Weight 108 lbs. unboxed RS232 Learn More
    $8,500.00

  • Mark Levinson 20.5 faceplate pair

    Mark Levinson 20.5 faceplate pair

    Mark Levinson 20.5 faceplates only one pair in factory packaging Learn More
    $550.00

  • Conrad Johnson MF2300a  just serviced

    Conrad Johnson MF2300a just serviced

    Conrad Johnson MF2300a just serviced with all new electrolytic capacitors This is a really musical and powerful solid state amplifier when operating in spec. This significant upgrade (there are 16 larger caps changed) will ensure you are listening to the amp in its proper electrical state. Learn More
    $1,650.00

  • 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

  • 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

  • Krell KSA300s

    Krell KSA300s

    Krell KSA300s recapped 8/18 2 available price is for each inquire for trucking rate Learn More
    $3,700.00

  • Krell KAV-2250 in black

    Krell KAV-2250 in black

    Krell KAV-2250 in black Krell owner's manual: http://krellonline.com/assets/support/Krell%20Spreads.pdf Learn More
    $1,950.00

  • Constellation Audio Hercules Mono Amplifiers

    Constellation Audio Hercules Mono Amplifiers

    Constellation Audio Hercules Mono Amplifiers, excellent condition, original rolling flight cases $155,000 retail Power output: 1000W into 8Ω (mono) Frequency response: 10Hz to 100kHz Total harmonic distortion: 1% Damping factor: 150 Gain: 32 dB Dimensions: 733.6 x 298.5 x 514.4mm Weight: 125kg each Learn More
    $59,000.00

  • Krell Showcase surround processor

    Krell Showcase surround processor

    Krell Showcase surround processor, with remote and cord, six month parts and labor or exchange warranty $4500 new Learn More
    $595.00

  • Linn Knekt-A Room Amp

    Linn Knekt-A Room Amp

    Linn Knekt-A 3 available price is for each Learn More
    $200.00

  • 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
    $3,999.00

  • 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
    $290.00

  • 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-150a low profile stereo or mono amplifier

    Krell KAV-150a low profile stereo or mono amplifier

    Krell KAV150a recapped it sounds and work like new. 120 day warranty. Learn More
    $999.00

  • 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
    $11,999.00

  • 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
    $4,999.00

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