Vintage Tube Amp

McIntosh MC240 Stereo Tube Power Amplifier Vintage. Famous Macintosh MC240 tube power amplifier There are peeling of letters and plating dullness due to aged deterioration. I use a Japanese post office. International Buyers – Please be careful? ·For used items: We can’t guarantee long term operation or discoloration. Thank you and best regards.

McIntosh MC240 Vintage Tube Amp – SkyFi Restored w/Premium Vintage Tubes. General: We painstakingly restored this classic and coveted stereo tube amplifier to its full glory. Internally we replaced every critical component while carefully maintaining the original sonic quality. This listing also includes a rare and correct McIntosh tube cover (tube cage). SkyFi Restoration Notes: This MC240 underwent an extensive electronic restoration in house. The electronic work included a full rebuild of the power supply using custom made multi-section capacitors that match the exact values and layout of the original power supply. The bias supply was also rebuilt with new parts. The selenium bias diode was swapped to silicon with proper adjustment resistor to maintain the ideal bias level for the unity coupled output section. We also replaced all of the paper and di-film capacitors in the signal path after finding them leaky and drifted. During the signal path capacitor replacement we checked all of the resistors and replaced any parts that had drifted out of tolerance. By default we replace the phase inverter balancing resistors and plate load resistors with precision metal film parts to ensure trouble free performance. To finish up, we replaced the power cord and inrush current thermistor. Tube Notes: This amplifier is fitted with a set of premium vintage tubes. The output tubes are RCA 6L6 (2) are labeled McIntosh at the base. All four are RCA made tubes. The two labeled RCA have brown colored getter flashes but still test strong and sound great! The 12BH7 are strong matched and balanced GE. The remaining tubes are all strong testing authentic Telefunken 12AX7 and 12AU7. Cosmetic Notes: This MC240 was well loved. It has moderate chrome pitting and light silkscreen wear which is common for McIntosh amplifiers from this era. There are also some scratches/markings on the black transformer covers and cage. Two historic Dave O’Brian clinic stickers flank the McIntosh 240 badge and show years 1971 and 1972. The company was founded in 1949 by Frank McIntosh. The company designs and produces audio amplifiers, stereo tuners and other consumer electronics products. Ownership: Unknown Connections: RCA Inputs, Screw Terminal Outputs General Sound: Smooth, uncolored, undistorted natural and clean Cosmetic Condition: 6 / 10 Working Condition: Working perfectly and tested in our lab and listening room. Included: Unit, power cord, manual, and tube cage. Packing: Will be packed using our highly developed in-house process and custom packing materials. Specs: Power output: 40 watts per channel into 8? (stereo), 80 watts into 2? (mono) Frequency response: 16Hz to 40kHz Total harmonic distortion: 0.5% Input sensitivity: 0.5V Signal to noise ratio: 90dB Speaker load impedance: 4? Tube 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 Weight: 56 lbs. Testing Process: 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. Please note we are not a repair shop and only restore what we own. 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. If we don’t have the original packaging, we use heavy-duty double-ply corrugated boxes with custom made to your item SealedAir Instapak expanding foam custom inserts. In many cases this has proven to be better than the original packaging! We also use high quality fiber reinforced tape to seal our packages. We have too many items for sale and it’s nearly impossible to keep track of offers outside of the official system. Our items are available for pick-up. No additional information at this time. You might also like. Dynavector 10×3 High-Output MC Phono Cartridge. Mcintosh MC2500 Solid State Amplifier – In Silver Finish! Music Reference RM-5 MK II Tube Preamplifier with Phono. Music Reference RM-9 Tube Amplifier With EL34′s.

McIntosh Tube Amplifier MC240 1960s Vintage. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “stevennguyen2016″ and is located in this country: US. This item can be shipped to United States.

• Brand: McIntosh
• Type: Power Amplifier
• Model: McIntosh MC240
• Country/Region of Manufacture: United States
• Modified Item: Yes

McIntosh Tube Amplifier MC240 1960s Vintage. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “stevennguyen2016″ and is located in this country: US. This item can be shipped to United States.

• Brand: McIntosh
• Type: Power Amplifier
• Model: McIntosh MC240
• Country/Region of Manufacture: United States
• Modified Item: Yes

Vintage McIntosh MC-240 Tube Stereo Amplifier – Great Working Condition. 6 New Pre-Amp Tubes Installed, Controls and Switches Cleaned. Comes with Black Steel Mesh Cover – Missing End Caps and Clips. Power Output: Stereo or twin amplifier – 40 watts continuous per channel. Monophonic – 80 watts continuous. Harmonic Distortion: Less than 0.5% at rated output or less, 20 cycles through 20,000 cycles. Typical performance is 0.3% or less at 20 cycles and 20,000 cycles at full power. Typical performance in the mid frequencies is 0.1% or less at full power. Intermodulation Distortion: Less than 0.5% for any combination of frequencies from 20 cycles through 20,000 cycles if instantaneous peak power is below twice the rated power. Phase Shift: Less than +6 degrees 20 cycles through 20,000 cycles. Frequency Range: At rated output: +0, -0.1 db 16 cycles through 40,000 cycles. +0, -0.5 db 16 cycles through 60,000 cycles. At one half rated output: +0, -1 db 10 cycles through 100,000 cycles. Noise and Hum: 90 db or more below rated output. Stereo or Twin Amp. (Isolated from ground) 4 ohms, 8 ohms, 16 ohms. (Center tap internally grounded) 600 ohms. (One side internally grounded) 125 ohms. (Isolated from ground) 2 ohms, 4 ohms, 8 ohms, 16 ohms, 32 ohms. (Center tap internally grounded) 300 ohms. (One side internally grounded) 62 ohms. (Isolated from ground) 25 volts. (Center tap internally grounded) 140 volts. (One side internally grounded) 70.7 volts. Less than 10% of rated load impedance. Input impedance – 250,000 ohms. Input sensitivity – 0.5 volts to 30 volts through gain control with input switch in MONO or TWIN AMP position. With the switch in the STEREO position, sensitivity is 2.0 volts through a balance control. 105 volts to 130 volts at 50/60 cycles: 145 watts at zero signal output: 270 watts at rated output. The power transformer is tapped for 117 volts and 125 volts. Voltage amplifier – One 12AX7 (drives both amps). Phase Inverter – Two 12AU7. Drive Amplifier – Two 12BH7. Cathode Follower Drive – Two 12AX7. Output – Four 6L6GC or 7027A. Chassis dimensions: 17 1/4″ long x 10 3/4″ wide x 8 high. See INSTALLATION on page 5 for minimum mounting space. Weight: Chassis only – 56 pounds. Finish: Chromium and Black. Printed Out Version of The. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “j_rcheckcashing” and is located in this country: US. This item can be shipped to United States.

• Model: MC-240
• Country/Region of Manufacture: United States
• Type: Power Amplifier
• MPN: MC240
• Brand: McIntosh

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 #. 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• 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

Thank you for visiting our site. Because it is old, there is rust and corrosion. Please check the details in the pictures. We appreciate your understanding in this matter. International Buyers – Please Note. We are located in Fukuoka Japan. It’s our pleasure to make you happy by proposing our recommend item. If you have any questions or request about items, please feel free to ask us. We Do Not Mark Merchandise Values Below Value Or Mark Items As “Gifts” – US And International Government egulations prohibit such behavior. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “take1016″ and is located in this country: JP. This item can be shipped to United States.

• Brand: McIntosh
• Type: Power Amplifier
• Modification Description: Restored to Factory Specs
• Custom Bundle: No
• Model: McIntosh MC240
• Country/Region of Manufacture: Unknown
• Modified Item: Yes

McIntosh MC240 Vintage Tube Amplifier – Fully Maintained by Our Contractor. It has been maintained by our designated contractor. Characters are missing here and there. Indication based on the Secondhand Articles Dealer Act: Hokkaido Public Safety Commission No. Note only for products that are turned on. Products that do not turn on are not eligible? The power supply for this product is AC100V 50/60Hz. A transformer may be required in some countries. If it is different from A type, a converter is required. You in areas other than 100V. If you use the transformer I sell, you can use it in areas other than 100V. If you have any other questions, please contact me. It may not be possible in some areas. (10-15 days to US). (10-30days or more to Other countries). International Buyers – Please Note. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “jamazon77″ and is located in this country: JP. This item can be shipped worldwide.

• MPN: MC240
• Brand: McIntosh
• Model: MC240

McIntosh MC240 Vintage Tube Amplifier – Fully Inspected by Our Shop – From Japan. Note only for products that are turned on. Products that do not turn on are not eligible? The power supply for this product is AC100V 50/60Hz. A transformer may be required in some countries. If it is different from A type, a converter is required. You in areas other than 100V. If you use the transformer I sell, you can use it in areas other than 100V. If you have any other questions, please contact me. It may not be possible in some areas. (10-15 days to US). (10-30days or more to Other countries). International Buyers – Please Note. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “jamazon77″ and is located in this country: JP. This item can be shipped worldwide.

• MPN: MC240
• Brand: McIntosh
• Model: MC240

Condition: Used Used and scratched for daily use Maintenance completed, each capacitor check, thermistor replacement, tube pin volume cleaning, bias voltage check The characters on the terminals and operation panel have disappeared considerably. International Buyers – Please Note. Thank you for your understanding. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “toru_jpn” and is located in this country: JP. This item can be shipped worldwide.

• Brand: McIntosh
• Type: Power Amplifier
• Modified Item: Yes
• Model: McIntosh MC240
• Country/Region of Manufacture: United States