Power Amplifiers

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

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

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

Goldmund 8.5 with a2 modules 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 Mimesis 10 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 Telos 300 Stereo Power Amplifier Silver Excellent Condition Original Box And Accessories Learn More

Goldmund VSR Mononoblock Power Amplifiers Silver Faceplate Great Condition 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

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

JBL Synthesis S820 Stereo Power Amplifier Power-200 Watts Per Channel Color-Black Learn More

Jeff Rowland MC-6 6 channel silver, excellent Learn More

Jeff Rowland Model 7 two pairs in service 1/24 inquire. one pair silver, one pair The shipping must be quoted. Please send you postal code. Learn More

Jeff Rowland Model 8 with flight case, over fedex and ups limits inquire for freight quote Learn More

Jeff Rowland Research Model 3 Learn More

Kenwood L-07 For repair, selling the pair as is 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

KR Enterprises KR800 mono amplifiers, very nice, extra tubes available Learn More

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

Krell 402 silver (1 available 6/22) We can provide this in any voltage worldwide. Black (1 available 11/22) Learn More

Krell 5200XD excellent, like new condition, all packing and accessories 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. IN REPAIR Learn More

Krell Audio Standard 2 coming soon 2/22 recapped approximately 3 years ago must ship freight inquire before purchasing please Learn More

Like new condition all packing and accessories Frequency response 20 Hz to 20 kHz +0, –0.08 dB <0.5 Hz to 100 kHz +0, –3 dB Signal-to-noise ratio >95 dB, wideband, unweighted, referred to full power output >115 dB, “A”-weighted Gain 26.2 dB Total harmonic distortion <0.04% at 1 kHz, at 200 W, 8 Ω <0.15% at 20 kHz, at 200 W, 8 Ω Input impedance Single-ended: 100 kΩ Balanced: 200 kΩ Input sensitivity Single-ended or balanced: 1.96 V RMS Output power 200 W RMS at 8 Ω 360 W RMS at 4 Ω Output voltage 113 V peak-to-peak 40 V RMS Output current 13.4 A peak Slew rate 40 V/μs Output impedance <0.015Ω, 20 Hz to 20 kHz Damping factor >530, 20 Hz to 20 kHz, referred to 8W Power consumption Standby: 1 W Idle: 182 W Maximum: 2100 W Heat output Standby: 3.4 BTU/hr. Idle: 623 BTU/hr. Maximum: 7182 BTU/hr. Inputs 5 single-ended via RCA connector 5 balanced via XLR connector Outputs 5 pairs binding posts Dimensions 17.1 in. W x 7.65 in. H x 21.10 in. D 434 mm W x 194 mm H x 536 mm D Weight 95 lbs., 43.2 kg (shipping) 85 lbs., 38.6 kg (unit only) Learn More

Krell Duo 300 XD excellent 10/10 condition, box/paperwork, cord etc Learn More

small profile package utilizing huge internal heat sinks to support Class A, balanced, and Krell Current ModeTM topology • Evolution CASTTM, voltage balanced, and singleended inputs. Evolution CAST, which stands for Current Audio Signal Transmission, is a proprietary method of sending the audio signal between components in the current domain, from a high impedance transmitter to a low impedance receiver. Krell components connected in Evolution CAST act together as an electrically unified whole, free from the deleterious effects normally inherent in connecting cables operating in the voltage domain. • Low feedback topology; only 8 dB of nested local feedback utilized. No global feedback is used. • Push-pull output stage with 10 pair of ultra high speed, high current, output transistors• Push-pull driver stage configuration resembling a miniature output stage This unique circuit actually powers the speaker load when the audio signal is at the zero-crossing point. Notch distortion is effectively eliminated, maintaining the benefits of Class A operation with the efficiency of an A/B design. • Massive 3 kW torroidal transformer, four 35 amp bridge rectifiers, and 110,000 microfarads of filter capacitance, ensure ample current under the most demanding circumstances. • A second low current transformer stabilizes voltage for ultra-quiet operation. • Internal high current line conditioning circuitry filters RF noise on the AC Mains and compensates for asymmetric power waveforms and DC on the AC Mains. Protection circuitry continuously monitors all amplifier operations. • 12 V trigger controllable We can Change it to your desire voltage Learn More

Krell Evolution 400 Mono Learn More

Krell FPB300 recapped Learn More

Krell FPB350m single mono Learn More

Krell FPB350mc one mono amp only excellent condition best shipped by truck, inquire Learn More

Krell FPB600 just recapped 12/23 excellent cosmetics We will crate this for shipment outside of the I95 corridor for an extra $225. 225lb shipping weight, inquire for freight options sold Learn More

Krell FPB700cx Fresh recap ready to ship 5/24 200lb shipping weight inquire for freight options We can voltage convert and ship this worldwide for an addition $250 conversion fee Learn More

Krell KAV-2250 silver with box last one, inquire to make sure still available Learn More

Krell KAV250-A/3, overhauled, new capacitors so they sound the way they should, 6 months parts and labor warranty, KAV-250a Stereo Amplifier Learn More

Krell KAV-500/5 Krell KAV-500 Multichannel Amplifier 100 Watts/Channel into 8 Ohms, 200 Watts into 4 Ohms 400 Watts/Channel bridged (2 channels) Mfr FR 20 Hz - 20 kHz ± 0.5 dB THD < 0.03% Input Impedance 100 kOhms Size: 6.25" H x 19" W x 17" D Weight: 47 pounds Price: $4,500 5 Channels ($3,000 2 Channel, $500 Per additional channel) Learn More

sold 12/23 another kav500/5 available 1/24 Krell KAV-500/5 Krell KAV-500 Multichannel Amplifier 100 Watts/Channel into 8 Ohms, 200 Watts into 4 Ohms 400 Watts/Channel bridged (2 channels) Mfr FR 20 Hz - 20 kHz ± 0.5 dB THD < 0.03% Input Impedance 100 kOhms Size: 6.25" H x 19" W x 17" D Weight: 47 pounds Learn More

Krell KMA-100 MK2 Monoblocks Class A 100W/Channel Silver Learn More

Krell KMA-i800 Reference Monoblocks Axpona show demos inquire for special pricing. (888)850-4366 Will ship directly from Krell factory to you, full new warranty Learn More

Inputs: RCA and Balanced Power output: 200 watts per channel into 8Ω (stereo); 400w/ch into 4 ohms, 800w/ch into 2 ohms and 1600w/ch into 1 ohm Learn More

Krell KSA-i400 NEW REFERENCE! IN STOCK! Please inquire for pricing and for trade-ins at (888)850-4366 Learn More

Krell KSA150 fresh recap on one 12/23 2 available the other not recapped excellent cosmetics on that one. Learn More

Krell KSA250 with KSA300s internal boards overhaul completed 8/23 Learn More

Krell KSA80B One owner all original excellent condition We can recap for $500 additional if desired before shipping. Later balanced version Learn More

Krell MRA mono amplifiers. The best Krell ever made. Only 50 were made I read somewhere. These were $150,000/pair when new. price is for both We have the crates. They are at the Krell factory and will ship there directly to your door after being recapped. As of 1/22 because of the worldwide pandemic situation the capacitors we prefer using are on backorder. So you may purchase these but we don't have an exact delivery date These are the best Krell amplifiers ever made. Incredible size and weight 770 lbs each in the crate. serial 10199070016 Learn More

Krell S-1500 5 Channel Amplifier Black Freshly recapped 5 Channel Amplifier Very Good Condition Original Box We also have a second black unit available 5/24 Based on a rock solid, linear power supply design, the S –1500 is virtually impervious to speaker demand or AC line fluctuations. A 1,500 VA toroidal transformer and robust, 80,000-microfarad array of quick -charging filter capacitors offer enormous energy storage, avail- able in an instant. This supply is designed for massive current delivery while maintaining an ultra-low noise profile. Surface mount technology is utilized in the amplifier channels to achieve the high circuit density required for wide bandwidth performance. Eight high- speed power devices per channel deliver 150 W into 8 Ohms and 300 W into 4 Ohms. The amplifier is stable at any load impedance. Krell Current Mode TM, fully balanced topologies, are utilized for all amplifier channels for the lowest noise and greatest detail retrieval. Class A circuitry is utilized in the input, pre -driver, and driver stages to provide the most accurate signal path. All channels support balanced and single -ended inputs. High quality, 5-way binding posts allow speaker connections via bare wires, spade lugs, or banana plugs. A modular platform provides an upgrade path for the S–1500/3, S –1500/5 and S –1500/6 amplifiers, enabling additional channels to be installed at any time. The base platform includes input and speaker connections for up to 7 channels, making upgrades a simple matter when desired. • 80,000 Microfarads of Filter Capacitance • 12 VDC Triggers • 17.3W,5.7H,19.8D Learn More

Krell 5 channel Showcase amplfiier In silver or black capacitors have been upgraded so this sounds like new and Krell modification performed to eliminate high standby idle (allowing for longer lifespan) performed. Will ship in your desired voltage. Krell box/packing. Excellent condition We are authorized Krell dealers Showcase 7 Showcase 6 Showcase 5 FREQUENCY RESPONSE 20 Hz to 20 kHz 20 Hz to 20 kHz 20 Hz to 20 kHz +0 dB, -0.15 dB +0 dB, -0.15 dB +0 dB, -0.15 dB .2 Hz to 95 kHz .2 Hz to 95 kHz .2 Hz to 95 kHz +0 dB, -3 dB +0 dB, -3 dB +0 dB, -3 dB SIGNAL TO NOISE RATIO >110 dB >110 dB >110 dB “A” WEIGHTED GAIN 26.2 dB 26.2 dB 26.2 dB TOTAL HARMONIC 1 kHz < 0.03% 1 kHz< 0.03% 1 kHz < 0.03% DISTORTION (THD) 20 kHz < 0.20% 20 kHz< 0.20% 20 kHz < 0.20% INPUT IMPEDANCE 45 kOhms 45 kOhms 45 kOhms INPUT SENSITIVITY 1.55 Vrms 1.55 Vrms 1.55 Vrms OUTPUT POWER 8 Ohms 125 W 8 Ohms 125 W 8 Ohms 125 W EACH CHANNEL DRIVEN 4 Ohms 250 W 4 Ohms 250 W 4 Ohms 250 W OUTPUT VOLTAGE Peak to Peak 90 V Peak to Peak 90 V Peak to Peak 90 V RMS 32 V RMS 32 V RMS 32 V POWER CONSUMPTION Stand-by 90 W Stand-by 80 W Stand-by 70 W Idle 150 W Idle 130 W Idle 110 W Max. 1600 W Max. 1400 W Max. 1200 W INPUTS 7 single-ended 6 single-ended 5 single-ended via RCA connectors via RCA connectors via RCA connectors 7 balanced 6 balanced 5 balanced via XLR connectors via XLR connectors via XLR connectors OUTPUTS 7 channels via 5-way 6 channels via 5-way 5 channels via 5-way binding posts binding posts binding posts REMOTE CONNECTORS 12 VDC Out 12 VDC Out 12 VDC Out (12 V trigger) (12 V trigger) (12 V trigger) via a 3.5 mm connector via a 3.5 mm connector via a 3.5 mm connector DIMENSIONS INCHES 17.3w x 5.7h x 19.8d 17.3w x 5.7h x 19.8d 17.3w x 5.7h x 19.8d CENTIMETERS 43.9w x 14.5h x 50.3d 43.9w x 14.5h x 50.3d 43.9w x 14.5h x 50.3d WEIGHT SHIPPING 68 lb., 30.8 kg 66 lb., 29.9 kg 64 lb., 29.0 k Learn More

Krell Theater 7 XD $11000 retail Multi Channel Amplifier Color: Black Frequency response 20 Hz to 20 kHz +0, –0.11 dB Signal-to-noise ratio >101 dB, wideband, unweighted, referred to full power output >114 dB, “A”-weighted Gain 25.5 dB Total harmonic distortion <0.02% at 1 kHz, at 100 W, 8 Ω, two channels driven; <0.20% at 20 kHz, at 100 W, 8 Ω, two channels driven; Input impedance Single-ended: 27 kΩ; Balanced: 54 kΩ; Input sensitivity Single-ended or balanced: 1.50 V RMS Output power, per channel 120W RMS at 8 Ω, 2 channels driven 115W RMS at 8 Ω, 3 channels driven 110W RMS at 8 Ω, 5 channels driven 105W RMS at 8 Ω, 7 channels driven 210W RMS at 4 Ω, 2 channels driven 190W RMS at 4 Ω, 3 channels driven 165W RMS at 4 Ω, 5 channels driven 140W RMS at 4 Ω, 7 channels driven Output voltage 93 V peak-to-peak 33 V RMS Output current 10 A peak Output impedance <0.025 Ω, 20 Hz to 20 kHz Damping factor >320, 20 Hz to 20 kHz, referred to 8 Ω Power consumption Standby: 1 W Idle: 66 W Maximum: 2000 W Heat output Standby: 3.42 BTU/hr. Idle: 225 BTU/hr. Maximum: 2200 BTU/hr. Inputs 7 single-ended via RCA connector 7 balanced via XLR connector Outputs 7 pairs five-way binding posts Remote connectors One 12 VDC input (12 V trigger) via 3.5 mm jack Dimensions 17.1 in. W x 7.65 in. H x 21.10 in. D Weight 80 lbs. Learn More

Krell Theater Amp Standard , detachable cord, black, recapped five years ago Learn More