Rare Vintage Moscode 300 Stereo Tube Power Amplifier Serviced and Upgraded

Saturday, May 6th, 2023
Rare Vintage Moscode 300 Stereo Tube Power Amplifier Serviced and Upgraded

Rare Vintage Moscode 300 Stereo Tube Power Amplifier Serviced and Upgraded

Rare Vintage Moscode 300 Stereo Tube Power Amplifier Serviced and Upgraded

Rare Vintage Moscode 300 Stereo Tube Power Amplifier Serviced and Upgraded

VINTAGE MOSCODE 300 STEREO TUBE POWER AMPLIFIER. Working – Fully Tested. Good Condition – Chassis Has a Few Scratches – See Pictures. Carefully inspect all connections and components under magnification. Reflow any solder joints as needed. Treat all plug and socket connections with contact preservative. Remove tubes, treat tube socket connections with DeOxit D-100 drops. Treat circuit adjust potentiometers with DeOxit. Tighten power supply capacitor top connections. Retorque Mosfet Output devices to heat sinks. Remove speaker protection relay, clean plug-in / socket connections, treat relay points. Full bench test, power, response, noise, THD, followed by a lengthy use & listening test. This is the one everyone wanted. Tube input, Mosfet output. The best of both worlds. Here is one that couldn’t be working better. Which transformed a standard 300 into a stellar, light years ahead performer. I say this because the stock 300 used a 6FQ7 / 6DJ8 input configuration. The “modded” moscode 300 incorporated 4 matched RAM branded 6FQ7′s, which are present in this unit. All in all a great sounding unit which will satisfy the most discerning audiophile, and may well be the last amplifier you will ever own. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “lped-electronics” and is located in this country: US. This item can be shipped to United States.
  • Type: Power Amplifier
  • Model: Moscode 300

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  • moscode 300

Vintage Altec 1569A tube amplifier serviced with new caps and bias adjusted

Monday, April 3rd, 2023
Vintage Altec 1569A tube amplifier serviced with new caps and bias adjusted

Vintage Altec 1569A tube amplifier serviced with new caps and bias adjusted

Vintage Altec 1569A tube amplifier serviced with new caps and bias adjusted

Vintage Altec 1569A tube amplifier serviced with new caps and bias adjusted

Vintage Altec 1569A tube amplifier serviced with new caps and bias adjusted

Vintage Altec 1569A tube amplifier serviced with new caps and bias adjusted

Vintage Altec 1569A tube amplifier serviced with new caps and bias adjusted

Vintage Altec 1569A tube amplifier serviced with new caps and bias adjusted

Vintage Altec 1569A tube amplifier serviced with new caps and bias adjusted

Vintage Altec 1569A tube amplifier serviced with new caps and bias adjusted

Vintage Altec 1569A tube amplifier serviced with new caps and bias adjusted

Vintage Altec 1569A tube amplifier serviced with new caps and bias adjusted

This amp is serviced by professional technician. It has new pair filter caps and adjust voltage to spec at 440V bias at -37. The amp panel has some missing paint, one round panel nut broke off and one panel latch screw missing replace with different screw. All tubes tested and strong. The pre tubes 6CA7 and rectify tubes are made in USA, the power tubes and new modern tubes they are same but not matching brand. The power transformer is 6289A, the output transformer is 16432. Please see all pics and zoom in for details, inputs, outputs, layout, features and overall condition. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “bluemoonscooter11″ and is located in this country: US. This item can be shipped to United States, Canada.
  • Model: Altec 1569A
  • Country/Region of Manufacture: United States
  • Type: Tube Amplifier
  • Brand: Altec Lansing

Dynaco Dynakit Stereo 70 ST-70 Vintage Tube Amplifier Serviced

Sunday, January 22nd, 2023
Dynaco Dynakit Stereo 70 ST-70 Vintage Tube Amplifier Serviced

Dynaco Dynakit Stereo 70 ST-70 Vintage Tube Amplifier Serviced

Dynaco Dynakit Stereo 70 ST-70 Vintage Tube Amplifier Serviced

Dynaco Dynakit Stereo 70 ST-70 Vintage Tube Amplifier Serviced

Dynaco Dynakit Stereo 70 ST-70 Vintage Tube Amplifier Serviced

Dynaco (Dynakit) Stereo 70 (ST-70). Vintage Stereo tube amplifier. Serviced: cleaned and vacuumed chassis, cleaned all controls and switches, and jacks. Tested all tube outputs. Installed replacement 7199 tube. Replaced fuse, connection at fuse holder and set bias. The Dynakit Stereo 70 is a complete dual 35 watt power amplifier kit which offers the highest possible fidelity, at low cost and in a compact arrangement. It uses a patented circuit of outstanding performance characteristics, along with top quality parts, including the new Dynaco Super-Fidelity A-470 transformers – the finest available. The measured specifications show that the Stereo 70 is an amplifier of unequalled performance, and its listening quality is also unrivalled by any regardless of price. The two non-interacting 35 watt channels provide adequate power, in a stereophonic or two channel system, for loudspeakers of any level of efficiency. The channels can be paralleled for a full 70 watts of low distortion output, suitable for practically any monophonic use even where several loudspeakers are in use in different areas. The high power capability and low internal impedance provide excellent damping for all types of high quality speaker systems without need to make adjustments to match specific speaker installations. The design features of your Dynakit which contribute to its superior listening quality include some which are not revealed by the customary steady-state laboratory measurements. For example, it does not exhibit bounce and flutter when pulsed with a transient signal. Thus a sharp percussive signal like a drum beat or a piano note will be reproduced with sharpness and clarity and neither overhang nor muddiness. The Stereo 70, unlike many other amplifier circuits, has been designed to provide its specified performance on a loudspeaker load, not just under laboratory measuring conditions. Therefore, the connection of a loudspeaker to the amplifier does not deteriorate its performance or listening quality. AS-IS sale due to age. This item is in the category “Consumer Electronics\TV, Video & Home Audio\Home Audio\Receivers & Amplifiers\Amplifiers & Preamps”. The seller is “infinityrecordsusa” and is located in this country: US. This item can be shipped worldwide.
  • Brand: Dynaco
  • Type: Power Amplifier
  • Model: ST-70

Peavey Vintage 100w Twin Tube Guitar Amplifier Serviced U0026 Ready

Saturday, December 24th, 2022

Vintage McIntosh MC240 Tube Stereo Power Amplifier (Serviced & Re-capped/Tubed)

Thursday, November 17th, 2022
Vintage McIntosh MC240 Tube Stereo Power Amplifier (Serviced & Re-capped/Tubed)

Vintage McIntosh MC240 Tube Stereo Power Amplifier (Serviced & Re-capped/Tubed)

Vintage McIntosh MC240 Tube Stereo Power Amplifier (Serviced & Re-capped/Tubed)

Vintage McIntosh MC240 Tube Stereo Power Amplifier (Serviced & Re-capped/Tubed)

Vintage McIntosh MC240 Tube Stereo Power Amplifier (Serviced & Re-capped/Tubed)

Vintage McIntosh MC240 Tube Stereo Power Amplifier (Serviced & Re-capped/Tubed)

Vintage McIntosh MC240 Tube Stereo Power Amplifier (Serviced & Re-capped/Tubed)

Vintage McIntosh MC240 Tube Stereo Power Amplifier (Serviced & Re-capped/Tubed)

Vintage McIntosh MC240 Tube Stereo Power Amplifier (Serviced & Re-capped/Tubed)

Vintage McIntosh MC240 Tube Stereo Power Amplifier (Serviced & Re-capped/Tubed)

Vintage McIntosh MC240 Tube Stereo Power Amplifier (Serviced & Re-capped/Tubed)

Vintage McIntosh MC240 Tube Stereo Power Amplifier (Serviced & Re-capped/Tubed)

McIntosh MC240 Tube Stereo Power Amplifier. A vintage McIntosh MC240 Tube. Stereo Power Amplifier (1961-65). In VG, if not EX cosmetic condition. For a detailed look of the unit up close. View listing photos & YouTube DEMO link. + new tubes & gold plated RCA’s installed. Reproductions of original literature also included. All service adjustments performed by a professional tech semi-retired with 45 years experience in high-end audio repairs to bring unit back to original factory specifications if not better. All products are fully tested. Faulty or under-spec components are replaced with modern high grade equivalents. Any known issues or potential weak points are rectified up-front to ensure these products continue to’sing’ for many years to come. Looks, sounds & performs beautifully. The unit shows signs of use, and is clean and working properly. That being said, due to the age of this device & the uncertain nature of vintage electronics. Tube Stereo Power Amplifier. The MC240 has on one chassis two 40 watt power amplifiers. In addition to use as a stereo amplifier, the flexibility of the MC240 permits it to be used as a monophonic amplifier that delivers 80 watts, or as two separate 40 watt amplifiers with each channel amplifying completely separate programs, or as two amplifiers for use with an electronic crossover network. Power output: 40 watts per channel into 8? (stereo), 80 watts into 2? Frequency response: 16Hz to 40kHz. Total harmonic distortion: 0.5%. Input sensitivity: 0.5V. Signal to noise ratio: 90dB. Speaker load impedance: 4? Valve complement: 1 x 12AX7, 2 x 12AU7, 2 x 12BH7, 2 x 12AX7, 4 x 6L6GC. Dimensions: 17-1/4 x 10-3/4 x 8 inches. Finish: chromium and black. EXTERNAL FEEDBACK US AUDIO MART. Vintage KEF 104 Reference Series Speakers #. As described, in beautiful condition. Thank you very much! Vintage VPI HW-19 MK-2 Turntable (1983) W/O Tonearm #. Vintage Marantz 6300 Turntable S/N 600514 #. Superior product, with packing like a brand new piece from the factory. Vintage Onkyo Integra M-504 Dual Mono Power Amplifier #. Item just as described. Packing was amazing item arrived undamaged. Vintage Marantz 6300 Turntable S/N C110139 #. Vintage Technics SL-1350 Direct Drive Automatic Turntable. Thrilled to have this rare item at a great price. Vintage KEF KUBE 107/2 Loudspeaker Active Equalizer (SP2163) #. Item packaged extremely well. Vintage McIntosh MC2105 Power Amplifier (Serviced & Recapped) #. Great packing for a fragile product. Vintage Conrad-Johnson MF-200 Power Amplifier (Serviced & Recapped) #. Vintage Nakamichi 700 ZXL Computing Cassette Deck #. Condition was better than expected. Vintage Pioneer PL-518 Auto Return 2-Speed Direct-Drive Turntable #. Item as described a true icon of audio history. Vintage McIntosh C33 Solid State Stereo Preamplifier (Serviced & Recapped) #. KEF 107/2 Reference Series Speakers Midrange/Tweeter HEADS #. The turntable was exactly as described and beautiful. You can tell it was packed with much care when I opened the box. I wish new products were packed with as much care and precision. Vintage Thorens TD160 Turntable in Original Box (Serial #252928) #. Awesome reel to reel player, just as described. Vintage Technics RS-1500US Limited Edition Carbon Fiber R2R By J-Corder #. Audioquest Anaconda XLR 2M Audio Interconnects #. Vintage Marantz 6300 Turntable w Empire 2000Z #. Vintage Thorens TD160 Turntable #. Very Nice B4 TT Packed Perfect. Vintage Yamaha YP-B4 Fully Automatic Turntable w Ortofon M20FL Super Cartridge #. A dream come true, better than new! Secure packaging, works perfectly! From the best electronic packing I have ever received to the unit. Vintage McIntosh MA6100 Integrated Amplifier Serial #P8346 (Serviced & Recapped) #. A Great Vintage McIntosh MA6100! Vintage McIntosh MA6100 Integrated Amplifier Serial #AE492 (Serviced & Recapped) #. A Great Vintage McIntosh MR78! Vintage McIntosh MR78 Stereo Tuner (Serviced & Recapped) #. Vintage Marantz WC-9 NOS (New Old Stock) UNSEALED IN BOX Wood Cabinet/Case #. Item arrived as described thank you. Vintage NOS (New Old Stock) Marantz WC-43 Wood Cabinet/Case (#303506472888). Vintage Bell Carillon 6060 Tube Amp (Professionally Serviced/Recapped/Re-tubed) (#303528395961). Perfect in every way!! Vintage Marantz 4270 Receiver Pro/Serviced & Recapped + LED Upgrade & WC-22 (#303400740547). Vintage Pioneer PL-560 Turntable with Stanton 680EE Cartridge & NEW Stylus (#303382638216). Nice clean unit, works great so far. Vintage Pioneer SPEC-2 Rack Mount Stereo Power Amplifier (3 Line Voltage Model) (#303423883114). Symposium Acoustics ULTRA Energy Absorption Platforms 19″ x 14″ (#303373067498). Exactly as described, well packed, insured, A+ follow-through! Vintage Pioneer SX-1010 Stereo Receiver (Serviced & Recapped + LED) #. The Amp is beautiful–pristine. Packing was beyond excellent. Vintage McIntosh MC 250 Solid State Stereo Power Amplifier (Serviced & Recapped) #. Knows how to pack stereo equipment. Vintage Mcintosh MA5100 Solid State Stereo Integrated Amplifier w Case & Panloc #. Vintage Thorens TD160 Turntable with Stanton Cartridge in Original Box #. Very happy with the record player. Vintage Thorens TD160 Turntable with Ortofon Cartridge #. Vintage Pioneer PL-530 Turntable with Audio Technica AT14Sa Cartridge #. Super helpful when I asked questions. Vintage Thorens TD160 Turntable with Grado Cartridge (#303581989275). Conrad-Johnson PV10A Stereo Tube Preamplifier With Phono Stage (#303562482278). Vintage McIntosh MAC 1700 Stereo Receiver w Wood Case (Serviced & Recapped) #. Vintage Pioneer SPEC-1 Rack Mount Stereo Preamplifier (3 Line Voltage Model) (#303423834381). I’m now in heaven with my new vintage receiver! Vintage Marantz 2270 Stereophonic Receiver (Serviced & Recapped + LED Upgrade) #. Turntable packaged with detail and care. It works and sounds great. Scott PS-87A Direct Drive Fully Automatic Turntable in Original Box (#303551572059). Item was as described. Vintage Marantz Model 6350Q w Shure V15 Type IV & NEW Jico VN-45HE Stylus (#303401938187). Vintage Sony CDP-X555ES Compact Disc Player (#303581875203). Always a pleasure to deal with. Vintage Marantz 2440 Quadradial 4 Adaptor Amplifier (#303581923887). Exactly as described, very professional packing. Vintage Technics SL-1900 Fully-Automatic Direct-Drive Turntable NO CARTRIDGE (#303533649155). Tannoy 12 Monitor HPD 315 Dual Concentric Drivers & Crossovers (#303546057249). The packing job was exceptional! My turntable was even better than described. Klyne SK-2A Moving Coil Preamp Step Up MC Preamplifier Head Amp + Manual (#303531778704). Vintage Marantz 2325 Pro Serviced & Recapped + LED Upgrade & Original Boxes (#303508296342). Vintage Technics SL-1900 Turntable w Pickering XSV-3000 & D3000 (#303370403737). Vintage Luxman SQ-707 Solid State Stereo Integrated Amplifier (#303552358482). Expert packing and great communication. Vintage McIntosh MA6100 Integrated Amplifier (Professionaly Serviced & Recapped) (#303538133604). Arrived quickly, items packed and padded perfectly. Vintage Technics SL-1301 Quartz Lock Direct Drive Automatic 120V/240V Turntable (#303356004338). Well packaged and as described – thank you. Vintage Nakamichi DR-3 Audiophile Professional Cassette Deck (#303274442807). A+++ all the way. Vintage AIMS VTB-120 1970s Bass/Guitar Tube Amp – 120 watts – Made in the USA (#303515606026). Vintage McIntosh MC2100 Stereo Power Amplifier (Serviced/Recapped) (#303514585192). This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “yesteryear_audio” and is located in this country: US. This item can be shipped to United States.
  • Brand: McIntosh
  • Type: Tube Amplifier
  • Modification Description: Serviced & Re-capped + new tubes & gold plated RCA’s installed. Reproductions of original literature also included.
  • Custom Bundle: No
  • Model: Mcintosh MC240
  • MPN: MC240
  • Country/Region of Manufacture: United States
  • Modified Item: Yes

Rare Vintage Fisher 800-C Tube Stereo Integrated Amplifier Fully Serviced

Tuesday, November 15th, 2022
Rare Vintage Fisher 800-C Tube Stereo Integrated Amplifier Fully Serviced

Rare Vintage Fisher 800-C Tube Stereo Integrated Amplifier Fully Serviced

Rare Vintage Fisher 800-C Tube Stereo Integrated Amplifier Fully Serviced

Rare Vintage Fisher 800-C Tube Stereo Integrated Amplifier Fully Serviced

Rare Vintage Fisher 800-C Tube Stereo Integrated Amplifier Fully Serviced

Rare Vintage Fisher 800-C Tube Stereo Integrated Amplifier Fully Serviced

Rare Vintage Fisher 800-C Tube Stereo Integrated Amplifier Fully Serviced

Rare Vintage Fisher 800-C Tube Stereo Integrated Amplifier Fully Serviced

Rare Vintage Fisher 800-C Tube Stereo Integrated Amplifier Fully Serviced

Rare Vintage Fisher 800-C Tube Stereo Integrated Amplifier Fully Serviced

Rare Vintage Fisher 800-C Tube Stereo Integrated Amplifier Fully Serviced

VINTAGE FISHER 800-C TUBE STEREO INTEGRATED AMPLIFIER. Working – Fully Serviced (Read Below for Service Report). Excellent Condition – See Pictures. Disassemble unit and inspect ALL solder connections under magnification. Reflow connections as necessary. Remove all tubes, treat all tube socket connections with DeOxit D-100 preservative. Check all tube connections for tension / tightness. Clean all switches and controls with DeOxit preservative. Check all power supply capacitors for integrity and AC ripple.. Replace any that do not test perfect. Check bias voltage and bias supply filter capacitor. Modify power resistor value in bias circuit to compensate for new type rectifiers higher voltage. Output tube bias now exactly on spec. Replace original output tube coupling caps with Jupiter audiophile Polypropylene types. Wow what an improvement! Replace all original smaller electrolytic capacitors with newer Elna and Nichicon types. Select phase inverter and audio (ECC83) types for best performance. This concludes audio section restoration. Now to FM & Multiplex. Remove tuning condenser cover. Lubricare condenser mechanics and dial string mechanism. Clean tuning condenser axle ground wipers and treat with DeOxit D100. This is absolutely necessary for best FM performance. _Perform full Dual Sweep alignment of FM RF, IF, and discriminator alignment using Sound Technology 1000A generator. Replace original 1uf 350v electrolytic with Nichicon polypropylene type. Also modify multiplex triggering circuit for more positive multiplex switching. Fisher 500C’s are known to have multiplex switching issues. This one is working perfectly and has wonderful separation. Select ECC83′s for best FM stereo performance and sound. Install LED lamps to illuminate dial glass. Install new foam behind front panel for proper light diffusion. Complete cosmetic clean up of dial glass, (it’s perfect), front panel (gorgeous) knobs and cosmetics. Oil Walnut case (it’s a beauty, not mint, but very, very nice) clean case aluminum tube cover, also beautiful, no heat stains.. Full bench test followed by a protracted use and listening test. FM, multiplex, phono performance is wonderful. Tech Comments: I have been servicing all brands of audio units, tubed and solid state, as a vocation, not a hobby, for nearly 60 years. I can honestly say that I have worked on hundreds of these receivers. This one has to be one of the nicest in recent memory. It appears to have been little used also. So we decided to “pull out all the stops” in servicing it. Wonderful FM, multiplex working as nicely as you will find, audio performance to die for. This one is a total winner, the front. Panel is near mint (most would describe it AS mint) it’s really stunning. You just don’t find them like this… What a great example of vintage tube audio! Tuning range: FM, MW. Power output: 30 watts per channel into 8? Frequency response: 25Hz to 25kHz. Total harmonic distortion: 0.7%. Input sensitivity: 3.3mV (MM), 230mV (line). Signal to noise ratio: 80dB (line). Channel separation: 50dB (line). This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “lped-electronics” and is located in this country: US. This item can be shipped to United States, Canada, United Kingdom, Australia, Japan, South Korea, Indonesia, South Africa, Bahamas, Israel, New Zealand, Singapore, Switzerland, Norway, Saudi Arabia, United Arab Emirates, Qatar, Kuwait, Bahrain, Malaysia, Barbados, Bangladesh, Bermuda, Brunei Darussalam, Bolivia, Egypt, French Guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman Islands, Liechtenstein, Sri Lanka, Monaco, Macau, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Denmark, Romania, Slovakia, Bulgaria, Czech Republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Greece, Portugal, Cyprus, Slovenia, Sweden, Belgium, France, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Republic of Croatia, Luxembourg.
  • Brand: Fisher
  • Type: Integrated Amplifier

Audio Research SP-8 SP8 Classic Vintage Tube Preamplifier -Serviced

Tuesday, October 11th, 2022
Audio Research SP-8 SP8 Classic Vintage Tube Preamplifier -Serviced

Audio Research SP-8 SP8 Classic Vintage Tube Preamplifier -Serviced

Audio Research SP-8 SP8 Classic Vintage Tube Preamplifier -Serviced

Audio Research SP-8 SP8 Classic Vintage Tube Preamplifier -Serviced

Audio Research SP-8 SP8 Classic Vintage Tube Preamplifier -Serviced

Audio Research SP-8 SP8 Classic Vintage Tube Preamplifier -Serviced

Audio Research SP-8 SP8 Classic Vintage Tube Preamplifier -Serviced

This is a MK1 SP8. Contrary to popular belief is better than the MKII. Thoroughly Bench checked works perfect. Best phono section ever. Notice not too many MK1 units for sale. The Mk1 was more expensive to produce. More parts and labor. More power supply storage on the main rectifier.. This item is in the category “Consumer Electronics\TV, Video & Home Audio\Home Audio\Home Audio Components\Other Home Stereo Components”. The seller is “ctech-electronics-store” and is located in this country: US. This item can be shipped to United States, Canada, United Kingdom, Australia, Japan, Korea, South, Indonesia, South Africa, Hong Kong, Bahamas, Israel, New Zealand, Singapore, Switzerland, Norway, Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Malaysia, Barbados, Bangladesh, Bermuda, Brunei Darussalam, Bolivia, Egypt, French Guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman Islands, Liechtenstein, Sri Lanka, Monaco, Macau, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay.
  • Compatible Brand: Audio Research
  • Type: Tube Pre-Amplifier
  • Brand: Audio Research

VINTAGE MAGNAVOX VACUUM TUBE AMPLIFIER 138BB & Control Amp 140B, Serviced

Monday, October 3rd, 2022
VINTAGE MAGNAVOX VACUUM TUBE AMPLIFIER 138BB & Control Amp 140B, Serviced

VINTAGE MAGNAVOX VACUUM TUBE AMPLIFIER 138BB & Control Amp 140B, Serviced

VINTAGE MAGNAVOX VACUUM TUBE AMPLIFIER 138BB & Control Amp 140B, Serviced

VINTAGE MAGNAVOX VACUUM TUBE AMPLIFIER 138BB & Control Amp 140B, Serviced

VINTAGE MAGNAVOX VACUUM TUBE AMPLIFIER 138BB & Control Amp 140B, Serviced

VINTAGE MAGNAVOX VACUUM TUBE AMPLIFIER 138BB & Control Amp 140B, Serviced

VINTAGE MAGNAVOX VACUUM TUBE AMPLIFIER 138BB & Control Amp 140B, Serviced

For sale, Magnavox amplifier set A138BB and 140B. Here is fully working vintage Magnavox vacuum tube amplifier that was pulled from a model CP242B console phonograph. It includes amp chassis 138BB and tone/volume/control chassis 140B. They are in excellent cosmetic condition. They have been fully tested. 2 new tubes were installed, the 5Y3 rectifier and the 12AX7. I even replaced the dial lamp. The other tubes, 6AV6 and the outputs (2)6V6 all checked good. The controls have been cleaned. Although this is a working set, it is advised for continued reliability that the unit be recapped. Please note that this is not a stereo amplifier it is a mono amplifier. If used with a magnetic cartridge a preamp will need to be used. With over 40 years of experience as a professional audio/video technician I know how to repair and service what I sell. I only sell quality working and tested units. This unit is used and keep in mind that it is from the 1950′s. It is guaranteed to perform as mentioned in the listing. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “sventeching” and is located in this country: US. This item can be shipped to United States.
  • Model: 138BB, 140B
  • Modified Item: No
  • Country/Region of Manufacture: United States
  • Custom Bundle: No
  • Type: Tube Amplifier
  • Brand: Magnavox

McIntosh MC-30 Monoblock Audio Amplifier Tube Amp MC30 Vintage Rare Serviced

Thursday, September 22nd, 2022
McIntosh MC-30 Monoblock Audio Amplifier Tube Amp MC30 Vintage Rare Serviced

McIntosh MC-30 Monoblock Audio Amplifier Tube Amp MC30 Vintage Rare Serviced

McIntosh MC-30 Monoblock Audio Amplifier Tube Amp MC30 Vintage Rare Serviced

McIntosh MC-30 Monoblock Audio Amplifier Tube Amp MC30 Vintage Rare Serviced

McIntosh MC-30 Monoblock Audio Amplifier Tube Amp MC30 Vintage Rare Serviced

McIntosh MC-30 Monoblock Audio Amplifier Tube Amp MC30 Vintage Rare Serviced

McIntosh MC-30 Monoblock Audio Amplifier Tube Amp MC30 Vintage Rare Serviced

Retro Gear Shop is a high-end boutique store located in Nashville, Tennessee. McIntosh MC-30 Serviced For sale is a rare vintage McIntosh MC-30 monoblock tube amplifier. This one just got back from a full servicing include full recap. It’s fully functional and ready to go. Check out the pictures to make sure you like it. Any questions please ask! This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “retrogearshop” and is located in this country: US. This item can be shipped worldwide.
  • Brand: McIntosh
  • Type: Tube Amplifier
  • Model: MC-30

Audio Research VT200 MKI Vintage Tube Amplifier Serviced 200W

Tuesday, August 16th, 2022
Audio Research VT200 MKI Vintage Tube Amplifier Serviced 200W

Audio Research VT200 MKI Vintage Tube Amplifier Serviced 200W

Audio Research VT200 MKI Vintage Tube Amplifier Serviced 200W

Audio Research VT200 MKI Vintage Tube Amplifier Serviced 200W

Audio Research VT200 MKI Vintage Tube Amplifier Serviced 200W

Audio Research VT200 MKI Vintage Tube Amplifier Serviced 200W

Audio Research VT200 MKI Vintage Tube Amplifier Serviced 200W

Audio Research VT200 MKI Vintage Tube Amplifier Serviced 200W

Audio Research VT200 MKI Vintage Tube Amplifier Serviced 200W

Audio Research VT200 MKI Vintage Tube Amplifier Serviced 200W

Audio Research VT200 MKI Vintage Tube Amplifier Serviced 200W

SkyFi Audio – Curators of Vintage Audio Gear. No mid-fi, no gimmicks, no junk. Each piece of equipment is cosmetically restored and fully tested in our well-equipped lab by an engineer with 30+ years of experience in the HiFi world. Through our sister company, which is an authorized dealer for McIntosh, Audio Research, Sonus Faber, ClearAudio, Project, and Sony ES, we have access to OEM parts, service, and support. We are big fans of the VT100 variation which we have a hard time keeping in stock. This is its larger brother VT200 MKI at twice the power, but with the same design and build quality. This is a very powerful tube amp capable of driving difficult loads with the same neutral and clear sound that you would expect from Audio Research. It has facilities for balanced and single ended operation and offers speaker connections from 1 ohm to 16 ohms. Serviced in house and working beautifully. Little to no signs of use cosmetically. Includes a custom dust cover (for when the amp is not in use obviously), and the manual. SkyFi Service Notes. All driver tubes replaced. Front end adjustments and bias set to service manual specification. Tube Notes. All driver tubes replaced with matched balanced JJ E88CC. All output tubes are pre-owned matched quads of Svetlana 6550 ribbed plate (Not Winged C). The SkyFi Testing Process for Tube Amplifiers. We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect resistors and other passive components for signs of overheating. If tube arcing has occurred in the past we can usually spot discoloration on the output tube sockets. On vintage units we often spot check select capacitors for value and ESR. If the amplifier passes visual inspection, we move on to a full test of all of the tubes. We use an Amplitrex AT-1000 Tube Tester which is capable of testing both emission and Gm with a high degree of accuracy. We document the results of each tube and replace any weak or suspect tubes before proceeding. When we power on tube amplifiers for the first time we usually use a variac and current limited AC supply and slowly raise the voltage up to nominal mains level while monitoring plate, screen, filament, and negative bias supply voltages where applicable. If everything is in order we feed a low level test signal into the amplifier’s input and monitor its output on an oscilloscope across an 8 ohm dummy load. At this point we are just looking to verify basic function and confirm that the output transformers are not damaged. Once we have verified that the amplifier is safe to operate, we connected it to full mains power. For cathode biased amps we monitor the plate to cathode voltage to determine if the output tubes are operating in a safe range. Once the output section is verified we move onto bench evaluation. We start by feeding the input of the amplifier with a low level 1KHz test signal, slowly increase its amplitude while monitoring the amplifier’s output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping. At this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance. We finish off the bench evaluation with a 1KHz square wave check and a 20Hz to 20KHz sine sweep to assess the amplifier’s frequency response characteristics. This battery of tests will usually reveal if the amplifier has any issues that need further attention. Before the device leaves the bench, we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics. If the unit passes all of these tests it is moved to our long term testing rig where we simulate real word operating conditions for 6-8 hours. For tube amps we like to run this test at least twice. This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when it has fully come up to temperature. We find this step to be essential, especially for vintage units. More from Audio Research: The VT200 vacuum tube stereo power amplifier is the most powerful of the three VT-series models. Rated at 200 watts per channel into a wide range of speaker loads, the VT200 encompasses a “dual mono” circuit layout reaching back to the massive single power transformer. Eight matched pair of 6650C output tubes and 674 joules of distributed energy storage give the VT200 unwavering control over the most difficult speaker loads, without sacrificing dynamic freedom or musical nuance. Separate left and right input and output circuit boards, with distributed power supplies, keep signal path lengths at a minimum for quicker transient attack and explosive musical dynamics. As with other VT models, constant-current sources in the input stage help maintain stable drive characteristics and differential balance of the output stage under the rapidly changing demands of actual music reproduction. Ultralinear output transformers with partial cathode coupling to the output terminals give the VT200 higher efficiency and lower output impedance than conventional vacuum-tube amplifiers. This results in better control of the loudspeaker throughout its frequency and impedance spectrum. Both single-ended (100K ohms) and balanced (200K ohms) inputs are included to allow use with any high-quality stereo preamplifier. Custom-machined, gold-over-brass five-way output terminals allow a secure, high-contact connection to a variety of speaker impedances: 1, 2, 4, 8 or 16 ohms. Internally, the VT200 presents a very open architecture within a spacious, rugged chassis. A single cooling fan operable at three different speeds provides unobstrusive cooling of interior components, including the vacuum tubes mounted along the chassis sidewalls. Biasing of the output tubes is easily accomplished via two trim pots for each channel, accessible through holes located along each sidewall of the chassis. Complete retubing kits of tested, selected and matched tubes for the VT200 are available through authorized Audio Research dealers, or from the factory. DETAILS and SPECIFICATIONS – MKI Tube stereo amplifier. 200 watts per channel continuous from 20Hz to 20kHz. 1kHz total harmonic distortion typically 1% at 200 watts, below. 01% at 1 watt. Approximate actual power available at “clipping”:210 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. (-3dB points) 12Hz to 120kHz. (-3dB points at 1 watt) 0.5Hz to 200 kHz. 2.5V RMS (Bal or SE) for rated output. (27 dB gain into 16 ohms). 200K ohms Balanced, 100K ohms Single-ended. 1, 2, 4, 8, 16 ohms. Approximately 0.8dB 16 ohm load to open circuit. Less than 0.2mV RMS – 109dB below rated output (IHF weighted, input shorted, 16 ohm output). POWER SUPPLY ENERGY STORAGE. 105-125VAC 60Hz (210-250VAC 50Hz) 990 watts at rated output, 1200 watts maximum, 680 watts at “idle”. VT200: (8 matched pairs) 6550C power output, (6) 6922 driver, (4) 6922 input. 19″ (48.3 cm) W x 10½” (26.7 cm) H x 23.6 (60.0 cm) D. Handles extend 1½ (3.8 cm) forward. (46.5 kg) Net; 148 lbs. Yes – Power Only. We have too many items for sale and it is nearly impossible to keep track of offers outside of the official system. We are currently operating from our shop inside our dedicated building in Glen Rock, NJ. We’re not a store, so please don’t make an appointment if you’re just curious as to how a speaker or piece of equipment sounds. In essence – no tire kickers please. This is super useful when purchasing large speakers or heavy amplifiers. It’s also great for ensuring your new turntable is setup correctly in its final resting place. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “skyfiaudio” and is located in this country: US. This item can be shipped to United States.
  • Brand: Audio Research
  • Type: Tube Amplifier
  • MPN: VT200 MKI
  • Model: VT200 MKI
  • Country/Region of Manufacture: United States