Power Amplifiers

There is a level of excellence at which conventional words about quality and cost-effectiveness become meaningless. Like the very best cars, watches, and wines, and every other assault on the consumer state of the art that you can actually buy, price ceases to be an object. You choose because it is a personal passion—if not an obsession—and because you are lucky enough to be one of the handful of people who really can afford the very best.The Evolution One amplifier is the result of the unrelenting pursuit of the most realistic musical reproduction possible in the home. Immensely powerful, the Evolution One is a monaural design that features a separate power supply for each channel. Stunning aesthetics hint at the advanced amplifier circuitry housed within its walls. The 450 watt Class A circuitry features the latest advancements in Krell amplifier design including the proprietary Krell Current Mode topology and the latest versions of the Krell Sustained Plateau Bias and CAST circuitries. Learn More

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

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

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

Kinergetics subwoofer amplifier Learn More

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

Jeff Rowland imaging, staging, and musicality in a beautifully crafted monoblock chassis capable of capturing the often elusive music and theater experience with grace and authority. Model 201 delivers a compelling musical experience with a linear frequency extension that ranges from a deep pitched bass to a textured treble, with rippling harmonics and nuanced low level resolution. This work of art, in both sight and sound, is a true Rowland. Housed in an elegant and compact chassis milled from aircraft-grade Aluminum ingots, the Model 201 monoblock power amplifier has been created to exacting JRDG artistic and engineering standards. The advanced green technology that delivers its refined performance, make the Model 201 monoblock power amplifier ideal for the most sophisticated stereo and multi-channel audio systems at a real world price. This is a used item that looks like new Learn More

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

JBL S400 stereo power amplifier Power output: 200 watts per channel into 8Ω (stereo), 400W into 8Ω (mono) Frequency response: 10Hz to 70kHz Total harmonic distortion: 0.02% Damping factor: 120 Input sensitivity: 1V Signal to noise ratio: 105dB Speaker load impedance: 4Ω (minimum) Dimensions: 5.5 x 19 x 16.5 inches Weight: 45lb Learn More

Janis Interface 1A Electronic crossover amplifier Learn More

Innersound Electrostatic Amplifier E 300 Innersound Electrostatic Amplifier Rated power 2000 VA/channel, 20Hz to 20 kHz, both channels driven into an electrostatic speaker of up to 4nF capacity 300 Watts/channel, 20Hz to 20kHz, both channels driven into a resistive 8 ohm load 600 Watts/channel, 20Hz to 20kHz, both channels driven into a resistive 4 ohm load Bandwidth –3dB at 5Hz through 100kHz with single-ended inputs DC through 100kHz with balanced inputs Distortion (THD+Noise) Less than 0.08% from 10Hz to 30kHz at full output, both channels driven Gain 26dB Slew Rate 50 Volts/microsecond Input Impedance 50 kohms unbalanced or 100 kohms balanced Noise Greater than 100dB below rated output Output Impedance 0.4 ohms from 20Hz to 20kHz Dimensions 17"W × 5.5"H × 14"D (43cm W × 14cm H. × 36cm D) Weight 41 pounds (18.5 kg) Learn More

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

Goldmund Mimesis 9.2 275 watts per channel mono block power amplifiers one of the best sounding amplifiers from this qulaity company Learn More

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

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

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

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

D'agostino Momentum Mono Amplifiers, one owner since new, very light use original flight cases Description: Solid-state monoblock power amplifier. Inputs: 1 balanced (XLR). Output power: 300W into 8 ohms, 600W into 4 ohms, 1200W into 2 ohms (all equivalent to 24.8dBW). Voltage gain, input impedance, output impedance: all not specified. Frequency response: 1Hz–200kHz, –1dB; 20Hz–20kHz, ±0.1dB. THD (300W at 8 ohms): 0.1% at 1kHz. Signal/noise: 105dB, unweighted (no reference given). Dimensions: 12.5" (317.5mm) W by 5" (127mm) H by 21" (533.4mm) D. Weight: 95 lbs (43kg). Please inquire with your zip code for shipping rate Learn More

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

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

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

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

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

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

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

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

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

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

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

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

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

B&K Reference 125.2 Stereo Power amplifier 125 watts per channel stereo amplifier Black Retail 1200 Learn More

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

Audio Research HD-220 Power amplifier Power output 220 watts per channel into 8 ohms from 20Hz to 20kHz. 380 watts per channel into 4 ohms. Power bandwidth Frequency response (-3dB points at 1 watt) 0.5Hz to 200 kHz Input sensitivity 4.0V RMS BAL for rated output. (20.8 dB Bal gain into 8 ohms.) Input impedance 300K ohms Balanced, 150k ohms SE Output taps Output regulation Approximately 0.07dB 8 ohm load to open circuit Overall negative feedback None Damping factor Approximately 130 Distortion Slew rate Rise time Hum & noise Less than 0.1mV RMS -112dB below rated output (IHF weighted, input shorted). Power supply energy storage 200,000 µF Power requirements 105-125VAC 60Hz (210-250VAC 50 Hz) 750 watts at rated output (220 WPC 8 ohms) 1200 watts max (380 WPC 4 ohms) 250 watts at "idle." Tube complement (2) 6H30 driver, (2) 6922 voltage amp. Other Output polarity: Non-inverting. Balanced input pin 2+ (IEC-268). Dimensions 19" (48.3 cm) W x 8.75"(22.2 cm) H x 19.5"(49.5 cm) D. Handles extend 1.5" (3.8 cm) forward. Weight 58.9 lbs. (26.8 kg) Net; 73.8 lbs. (33.6 kg) Shipping Learn More

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

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

Adcom GFA5500, very good cosmetics. bench tested Learn More

Adcom GFA5300 bench tested, works properly Learn More

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