Power Amplifiers

Jadis Defy 7 will not ship until mid 2023 in repair, needs new transformer Learn More

Halcro DM68 upgrade servicing (caps) 1/19 black pair , top of the line worldwide voltage inquire for actual trucking charges sold Learn More

Goldmund VSR Mononoblock Power Amplifiers Silver Faceplate Great Condition Learn More

Goldmund Telos 300 Stereo Power Amplifier Silver Excellent Condition Original Box And Accessories Learn More

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

Goldmund Mimesis 10 Learn More

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

Goldmund 8.5 with a2 modules Learn More

Fourier Triomphe OTL large tubed amplifier sold ? http://www.one-electron.com/Fourier.html 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

Dynaco ST 150 power amplifier The Dynaco Stereo 150 is a basic two channel power amplifier employing all silicon semiconductors. They include 24 transistors, 2 zener diodes, 16 diodes, and 2 thermal sensors. The output circuitry is of the full complementary symmetry design. The entire amplifier, except for an input network, is direct coupled. It's measured distortion levels approach the threshold of much laboratory test equipment, not only at the commonly specified full power ratings, but more importantly at very low power outputs as well. This is the result of circuit techniques which eliminate any discernible crossover notch at low levels, and contributes to the Stereo 150's freedom from listening fatigue. It's accurate, uncoloured sonics have been achieved on a wide variety of loudspeaker loads, including electrostatics and multiple drivers with complex crossovers. The design of a very fine power amplifier implies the necessity of several protection techniques for the amplifier, and for the speaker load. In addition to the AC line fuse, four separate B+ fuses are supplied. Electronic volt-amp limiting ensures safe operation of the output transistors, and a thermal sensor mounted directly on each output stage reduces the input if high temperature occurs. An unusually large radiating area for the heat fins, which are coupled to an aluminium back panel, form a highly efficient heat sink. Speaker fuses protect the load. The Stereo 150 has been designed as two independent 75 watts (at 8 ohms) amplifying channels with a common power supply having a high degree of inherent regulation. In addition, where higher powers or higher volt-amp capabilities are required for lower load impedances, easy internal restrapping permits monophonic operation for 150 watts output (at 8 ohms). An accessory kit is planned at additional cost for two output meters and meter switching, which includes alternative inserts for the front panel. Specifications Power output: 75 watts per channel into 8Ω (stereo) Frequency response: 20Hz to 20kHz Total harmonic distortion: 0.25% Damping factor: 50 Input sensitivity: 1V Signal to noise ratio: 95dB Speaker load impedance: 4Ω to 16Ω Semiconductors: 24 x transistors, 2 x zener diodes, 16 x diodes, 2 x thermal sensors Dimensions: 14.5 x 13.75 x 7 inches Weight: 29lbs Learn More

Devialet Expert 200, original box/packing, excellent condition Learn More

Crown SA 2 Distinction Series Amplifier Very Good Condition Learn More

Crown Reference 1 in service 9/21 Inquire before purchasing 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

Crown K1 Balanced Current Amplifier (4 available) in 3/23 consumer used only Crown K1 Amplifier at a Glance: Balanced Current Amplifier technology ensures thermal stability without a fan! Delivers 350 watts at 8 Ohms, up to 1500 watts (bridged) at 4 Ohms Incredibly flat frequency response for compromise-free audio Massive power with one tenth the heat! The K1 amp from Crown is the first amplifier to take advantage of Crown's new Balanced Current Amplifier technology. This technology yields extremely efficient power amplification while generating just one-tenth the heat of conventional amplifiers. In fact, the powerful K1 Amplifier can deliver an amazing 750 watts per channel into 2 Ohms (and that's a very solid 2 Ohms)! As a result the amp can put out clean, uncolored power without the use of a fan. No fan means the K1 runs quietly and cleanly, takes up less space in a rack and requires less maintenance. The K1 also boasts advanced circuitry protection that guards against DC, mismatched loads, internal faults and high frequency overloads. Crown is so confident of the K1's stability that it's backed by a three-year no fault warranty! Power to spare, no matter what your configuration The Crown K1 Amplifier is rated to deliver 350 watts per channel at 8 Ohms, 550 watts into 4 Ohms or 750 watts per channel into 2 Ohms. In addition, in bridged mode the K1 has a capability of 1100 watts at 8 Ohms or 1500 watts at 4 Ohms - all while running without a fan! The K1 is cool, clean and quiet. Legendary Crown frequency response Crown amps have a long history of providing crystal-clear audio response in critical listening situations, and the K1 Amplifier is no exception. Flat frequency response: (+/- .25 dB) from 20Hz to 20kHz ensure you get out of the K1 exactly what you put into it! Crown K1 Amplifier Features: Soft Start (Keeps amp from drawing large currents when first turned on) Switchable Input Sensitivity (1.4V or 26dB) Mono mode switches: Bridged, Y (parallel) or both (for daisy chaining) Balanced XLR and 1/4" inputs 5-way binding posts Channel 1 and Channel 2 gain controls with notched settings LEDS: Thermal (Warns of need to dissipate heat), Clip (Warns of distortion in the amp), IOC (Input / Output Comparator: Warns of distortion at 1/30th the level of clipping by comparing the actual waveforms of the input to the output), Signal (glows when output signal is present), Enable (Indicates Power status) Frequency Response: +/- .25 dB for 20Hz - 20kHz Power Output (per Channel): 750 watts into 2 Ohms, 550 watts into 4 Ohms, 350 watts into 8 Ohms Bridged (mono) power: 1500 watts at 4 Ohms, 1100 watts at 8 Ohms Signal-to Noise (A Weighted): >100dB below rated power Damping Factor: >3000 from 10 to 400Hz Input Impedance: Nominally 20KOhms balanced, 10KOhms unbalanced Passive convection cooling allows amplifier to drive 2 Ohm load at 8db into clip in 104 degree environment! Power Supply can configure to 100, 120, 200, 220, 230, 240, 250 VAC at 50 or 60 Hz Learn More

Crown D-150 excellent like new condiition Was in a rack since new. Learn More

Audiophile-grade 2 channel amplifier High-performance Class AB design Discrete high-current, bipolar output transistors Learn More

Crestron CNAMPX 12 X 60 multi channel power amplifier Learn More

Counterpoint SA12 Learn More

Conrad Johnson Premier 8 XS recently factory checked with newer tubes in 4/23 in 6/23 must ship by truck Learn More

Conrad Johnson Premier 11a We purchased this Premier 11a no tubes buy yourself some new ones and no need to worry about what would be in them Premier Eleven Vacuum Tube Amplifier Essentially a scaled down, stereo version of the Premier Eight, the Premier Eleven delivered 70 watts per channel from a single pair of 6550 output tubes. The Premier Eleven used only the finest component parts in all stages including the power supply. The power supply used only polypropylene and “cjd” polystyrene capacitors as opposed to the traditional deployment of electrolytics. The main storage reservoir used polypropylene capacitors with polystyrene shunts. The Eleven-A added a noise filter on the bias indicator circuit, first employed in the Premier Twelve. Features: 5-way binding post speaker connectors one pair of inputs two plate fuses power switch Replacement Tube Sets: RTPR11 or RTPR11XS V1 & V2: 5751 | V3 & V4: 6FQ7/6CG7 | V5-V8: 6550 Premier Eleven, Eleven-A: V5-V8: You could use kt120 tubes also without any modificaton but the cage will not fit because of the taller tube size. (I always thought they looked much better without the cages on anyway) Specifications: Power Output ­ Ultralinear Operation: 70 watts per channel RMS at 4, 8, or16 ohms both channels driven from 30Hz to 15kHz with no more than 1% THD or IMD. Power Output ­ Triode Operation: 30 watts per channel RMS at 4, 8, or16 ohms both channels driven from 30Hz to 15kHz with no more than 1.5% THD or IMD. Frequency Response: 20Hz to 20 kHz, +0, -.1 dB Input Sensitivity: 0.9 volts to rated power Hum & Noise: 96 dB below rated power Mechanical: Dimensions: 17.5W | 7.25H | 15D inches Weight: 48 lbs. Learn More

Conrad Johnson LP260se very similiar to all the top of the line CJ monos These have teflon caps, maybe one year of use on these only. Basically these are ART monos without the better gold cosmetics on the transformers. Learn More

The conrad-johnson design team is committed to adapting the advances from our state-of-the-art pursuits to more affordable offerings accessible to a wider range of music lovers. This resolve is clearly evident in our new range of Classic amplifiers. Borrowing heavily on the technology of our flagship ART amplifier, the Classic amplifiers preserve the distinctive tonal character of individual instruments and voices, with each clearly located within the overall acoustical environment of the original recording. Musical transients are reproduced with realistic impact, but without artificial enhancement. Like their more costly siblings, the Classic amplifiers capture the emotional impact of the live event, never getting between the listener and the musical performance. There really is no mystery to our chosen path to outstanding musical performance: best results come from simple circuits executed with quality parts. The circuit design for the Classic amplifiers is about as simple as possible, employing just seven vacuum tubes in the Classic Sixty-Two. Single-ended triode voltage gain and inverter stages are coupled to an output stage comprised of a single pair of ultra-linear operated EL34 tubes for each channel. The Classic One-Twenty adds a second pair of output tubes to each channel to achieve twice the output power. Simple but highly effective discrete voltage regulators supply rock-solid stable DC voltage to the critical voltage gain and inverter stages. And speaking of simple, maintenance of the Classic amplifiers could hardly be easier: the owner need only make a simple bias adjustment using the built in bias indicators when installing fresh output tubes. The use of premium quality component parts is the other half of the conrad-johnson recipe for superior musicality. In this area as well, the Classic amplifiers are leaders in their class. Precision, metal-film resistors yield low noise performance for greatest clarity. Polypropylene and polystyrene capacitors, chosen to achieve a high degree of temporal accuracy, are specified for both the audio cir¬cuits and the regulated plate voltage supplies for the input and inverter stages. The result is an exceptional range of dynamics – reproducing both subtle variations in level as well as dramatic loud crescendos. Our proprietary trans-spectral wide-bandwidth output transformers contribute importantly to the extended, “airy” highs that help distinguish the Classic amplifiers from ordinary tube amplifiers. The base model Classic amplifiers offer an ideal introduction to the joys of modern tube amplifiers, while the ease of use, low maintenance costs, and reliability will be a revelation for those who have only experienced “entry-level” tube gear. Those who wish to take the experience a step further will want to investigate the upgraded Classic Sixty-Two SE and Classic One-Twenty SE amplifiers. These special edition versions upgrade the output tubes to KT120s and incorporate CJD Teflon Capacitors and ultra high-performance metal foil resistors in strategic applications in the circuit. Any of the Classic amplifier models are sure to rekindle your passion for enjoying great music in your home. Learn More

Classic 120 Vacuum-Tube Stereo Power Amplifier Specifications Classic One-Twenty (CL120): Power: CL120 &120SE: 125 Watts per channel from 30 Hz to 15 KHz at no more than 1.5 % THD, both channels driven into 4 Ohms (also available connected for 8 or 16 Ohm loads) Sensitivity: CL120 & 120SE: 0.9V rms to rated power Frequency Response (at 10 Watts): 20 Hz to 20 kHz, +/- .3 dB Hum and Noise: 96 dB below rated power Phase: phase correct Input Impedance: 100 kOhms Tube Complement: CL120: 3 x 6922, 8 x EL34 CL120SE: 3 x 6922, 8 x KT120 Dimensions: CL120 & 120SE: 18.88D x 19W x 7.63H inches Weight: CL120 & 120SE: 75 lb. net 3-Year Warranty Every conrad-johnson Classic Amplifier is patiently and carefully hand assembled, then individually inspected and its performance verified by an experienced audio technician Learn More

Classe Sigma 5 $5000 USA retail nformation The Sigma series AMP5 is a 200W/Ch five-channel amplifier derived from the AMP2, but with necessary part and layout changes to accommodate its five-channel architecture. Like the AMP2, it utilizes switching technologies for both power supply and amplification stages. A Classé-designed switch mode power supply with Power Factor Correction makes over 1,000W of clean and stable power available while being both compact and efficient. A new class D amplifier topology provides wide dynamic range, smooth and extended frequency response and rich harmonic detail to yield stunning sonic performance. The efficiency of class D adds efficiency, low heat dissipation and relatively small size to the list of the AMP5’s attributes. The Sigma series AMP5 is a 200W/Ch five-channel amplifier derived from the AMP2, but with necessary part and layout changes to accommodate its five-channel architecture. Like the AMP2, it utilizes switching technologies for both power supply and amplification stages. A Classé-designed switch mode power supply with Power Factor Correction makes over 1,000W of clean and stable power available while being both compact and efficient. A new class D amplifier topology provides wide dynamic range, smooth and extended frequency response and rich harmonic detail to yield stunning sonic performance. The efficiency of class D adds efficiency, low heat dissipation and relatively small size to the list of the AMP5’s attributes. Specifications Details All tests un-weighted and 20Hz - 20kHz measurement bandwidth used. Frequency response 10Hz - 20kHz, -1dB into 4Ω Output power 200W rms into 8Ω All channels driven 400W rms into 4Ω Any two channels driven* Harmonic Distortion 0.018% @ 1kHz All channelsdriven to 1/8th power into 8Ω Peak Output Voltage 113V peak to peak, 40V RMS no load 113V peak to peak, 40V RMS into 8Ω Input Impedance 100kΩ Balanced / 50kΩ SE Voltage gain 29 dB Input level at clipping 1.4Vrms Balanced/SE Intermodulation Distortion >80 dB below fundamental into 8Ω SE Signal to Noise Ratio -100 dB at peak output into 8Ω (AES17) Rated power consumption 200W @ 1/8th power into 8Ω Mains voltage 100V - 240V, 50/60Hz Overall Dimensions Width: 17.00" (433mm) Depth (excluding connectors): 14.57" (370mm) Height: 3.75" (95mm) Net weight 23.1 lb (10.48 kg) *each channel supports 400W output into 4 ohms but the AC Mains/power supply cannot support all channels driven simultaneously at this level, which would require over 2,500W and only occur under a special test condition. Every channel easily drives lower impedance loads. Learn More

Power output: 250 watts per channel into 8Ω (stereo), 1000 watts 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: 65lbs Learn More

Cinenova 7 seven channel in 4/22 Learn More

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

Cello Performance II amplifiers in 7/23 We will recap the amplifiers before shipping. very good condition, one owner since new Inquire for freight options Learn More

Top of the line. Cary 211M mono amplifier, used pair in excellent condition original crates and double boxes. Photos are without tubes but you get those packed separately. It is well known that using monoblock amplifiers, as opposed to both channels together as a stereo chassis, is the best way to get powerful and lifelike music. By using separate power supplies that can be much more massive, each amplifier can have more dynamic power and be quieter. Keeping two separate amplifiers also makes any inter-channel crosstalk in the amplifiers impossible, so separation is better, meaning your soundstage and musical imaging will be larger and more well-defined. The simple act of separating the two channels provides a lot of distinct advantages, but also increases the investment because of needing to double up on power supplies and chassis parts. Learn More

Cary Audio 805RS latest version $16000 retail, new full warranty. Make sure you only buy from an authorized dealer (we buy directly from the manufacturer()so you get the manufacturer's warranty. You have your choice of silver or black. Priced to low to advertise/please phone or leave your number and we will call you back The weight in the crates is 140lbs each box, 33x19x17 The shipping calculator here would be double. inquire for shipping price worldwide Learn More

Cary Audio 805AE pair with fancier anthracite black transformers cans instead of the standard flat black. NEW! full factory warranty These must be send by truck within the USA and FEDEX/UPS internationally. Please inquire for a freight quote, usually $250-300 domestically. The picture shown is just a stock photo. The amp are at the Cary factory Learn More

Carver Silver Seven 4 chassis mono amplifiers Learn More

Burmester 909 IIIa stereo Learn More

Bryston 9bst 3 channel version with 2 channels of Lexicon added Learn More

Bryston 6b Stereo Amplifier Learn More

Bryston 4b thx version Just recapped for like new sound and reliability Learn More

Bryston 4B e 4be (commercial version , balanced looks like 4bst to me) 2 available 2/22 used in a home only Learn More

Bob Carver VTA305 Black Beauty Monoblock Pair with original boxes in 1/23 Learn More

Bedini BA-803 2 available excellent cosmetics, unused last twenty years. Original boxes. 250 watts Class A Operation Learn More

Balanced Audio VK75SE Learn More

Balanced Audio Technology VK-250, excellent condition Learn More

Balanced Audio Technology REX In late 1/23 original box top of the line Learn More

B&K ST1400 MK II good cosmetics Learn More

B&K Reference 200.7 Looks like new old stock. Original box/packing 200 Watts/channel 76lbs Learn More

B&K AV6000 bench tested 5/18 Learn More

B&K AV2500 series II, one owner since new, individual level controls for each channel, very nice condition Learn More

Audio Research VS110 2 available price is for each unused since 2014 in 11/2021 Given the enthusiastic response to the appearance and sonic peformance of the VS55, you will be happy to know that a more powerful version of this remarkable amplifier is now available: the VS110, rated at 100 WPC. This brings vacuum-tube musicality as only Audio Research can do it to a new power level and price. The chassis, circuit layout and feature set of the VS110 are almost identical to the VS55, but scaled up to accomodate the greater power output. The chassis itself measures 17 ½" W by 19" D, and features an anodized, natural-finish top plate labeled with tube location/type, output-tube bias access points and the inset Audio Research logo. The chassis front holds a rocker-style power switch and green LED "on" indicator. The chassis rear provides the 0-4-8 ohm 5-way binding posts, voltmeter test points for setting bias, a 12V in/out trigger and a detachable 14-gauge A.C. line cord with IEC socket. There are two matched pair of 6550C output tubes in each channel, fed by two 6NIP triode driver/followers, which in turn are fed by a single 6NIP input tube. Storage capacity of the bulk power supply is double that of the VS55 and uses the same type of fast, low-ESR Nichicon® capacitors. The simplicity and purity of the audio circuit is a proven performer, but now it can deliver more power for larger speakers in larger rooms. Like the VS55, the VS110 ships in one color /chassis configuration, black with natural anodized top plate. A perforated cage-type cover is optional, and must be ordered as a separate item. The sonic signature of the VS110 is very much like that of the VS55, but with more robust dynamics, greater bass impact and power, and a larger soundstage. With so much similarity between these two amplifiers, choosing the right amplifier is simple. The look, the feature set, the circuit types are identical: it is simply a question of how much power you need or want. The VS110 combines classic tube-amplifier appeal with robust power, genuine musicality and solid value. And don't forget Audio Research's unmatched record for long-term product support - a key measure of keeping customers satisfied, decade after decade. POWER OUTPUT 100 watts per channel continuous from 20Hz to 20kHz. 1kHz total harmonic distortion typically 0.5% at 100 watts, below .05% at 1 watt. Approximate actual power available at "clipping": 120 watts (1kHz) (Note that the actual RMS power output is dependent upon both line voltage and "condition" ie: if power line has high distortion, maximum power will be affected adversely, although from a listening standpoint this is not very critical.) POWER BANDWIDTH (-3dB points) 10Hz to 40kHz FREQUENCY RESPONSE (-3dB points at 1 watt) 0.8 Hz to 40 kHz INPUT SENSITIVITY 1.1V RMS Single-ended for rated output. (28dB gain into 8 ohms) INPUT IMPEDANCE 100K ohms Single-ended OUTPUT TAPS 8 ohms, 4 ohms OUTPUT REGULATION Approximately 0.9dB 8 ohm load to open circuit OVERALL NEGATIVE FEEDBACK 12.7dB DAMPING FACTOR Approximately 11 DISTORTION 1kHz total harmonic distortion typically 0.5% at 100 watts, below .05% at 1 watt SLEW RATE 6 V/µs RISE TIME 10 µs HUM & NOISE Less than 0.2mV RMS - 103dB below rated output (IHF weighted, input shorted) POWER SUPPLY ENERGY STORAGE Approximately 332 joules POWER REQUIREMENTS 105-125VAC 60Hz (210-250VAC 50Hz) 620 watts at rated output, 900 watts maximum, 400 watts at "idle" TUBE COMPLEMENT (4 matched pairs) 6550EH power output, (5) 6N1P input and driver OTHER Output polarity: Non-inverting. Voltmeter test points for bias. 12 VDC in/out trigger. Detachable 14 gauge AC line cord with IEC socket. DIMENSIONS 17½" (44.5 cm) W x 7.9" (20.1 cm) H x 19" (48.3 cm) D. Rear connectors extend .88" beyond chassis WEIGHT 61 lbs. (27.7 kg) Net; 69 lbs. (31.4 kg) Shippin Learn More

Audio Research SD135 excellent condition, original box $5000 retail in 1/23 Learn More