The capacitors looked good enough to at least plug the amplifier in & it did not blow any fuses/transformers. The power indicator light up. All 4 rubber feet on the bottom are hardened and should be replaced. The presence, scratch filter & rumble filter knobs can all be pressed in. All knobs adjust freely. There is some dust/aging almost everywhere on this amp, but I’m sure it would clean up nicely with proper attention to detail. This was an estate find & I do not know how long it was sitting – I would assume that some work. From a smoke & pet free environment. Device will be packaged with extreme care. Reference the photos and description carefully to see the quality of the exact product you will receive. Please reach out with any questions!
Vintage Heathkit Daystrom AA-100 Integrated Stereo 7591 Tube Amplifier. I tested the amplifier and it is not functional. It does power on, the vacuum tubes are warming up, but there’s only humming noise can be heard from the speaker system. It definitely needs new capacitors. All vacuum tubes are present, as well as all original knobs and regulators. Everything is intact except the fuse holder which is located on the back panel. The amp is clean and looks very nice cosmetically. Please refer to all pictures I took from different angles. Power output: 25 watts per channel. Frequency response: 30Hz to 15kHz. Total harmonic distortion: 0.5%. Input sensitivity: 1.5mV (MM), 200mV (line). Signal to noise ratio: 55dB (MM), 70dB (line). Speaker load impedance: 4? To 16? Valve complement: 2 x EF86, 4 x 12AX7, 2 x 7199, 4 x 7591, 1 x GZ34. Dimensions: 15.25 x 5 x 13.5 inches.
Eico HF-81 Vintage Integrated Tube Amplifier – Fully Rebuilt. General: The Eico HF-81 is a classic example of an excellent sounding 1960′s integrated tube amplifier. This vintage beauty has a full tube preamp and power amp delivering up to 14W of warm tube power. This is a rather rare combination for an integrated amp, as most are a hybrid designs with a solid state preamp a tube amp (or vice-versa) like the McIntosh MA230, MAC1500, etc. We were truly impressed at the sound quality of this piece during long-term testing on our test rig. In particular we thought vocals sounded fantastic, especially period correct Elvis and Sinatra. This particular HF-81 was completely overhauled before arriving into our shop and performed excellent in all of our bench and long-term listing tests. This HF-81 will come to you with a reprinted manual and a custom made dust cover. SkyFi Cosmetic Notes: This piece received a cosmetic overhaul at some point in the past. All chassis parts were repainted. The transformers were painted as well. It also appears as though all new hardware was installed. The manual is a reprinted copy. No silkscreen in present on the rear panel, but we’ll provide a printed diagram with all of the input labels and tube locations. SkyFi Technical Notes: This unit came to us having already undergone an extensive electronic restoration. Here is a rough outline of what we picked up on during our testing and review process. This unit was fully recapped including a new CE multi-section can, axial electrolytics, a mix of film and PIO coupling caps, and select mica capacitors. Select resistors replaced, modern three prong power cord added, SEP/COM Switch removed from circuit, a power switch was added to the rear panel, and a phono grounding lug was installed. Tube Notes: The rectifier tubes are current production Electro Harmonix. The output tubes are Groove Tubes EL84, the 12AX7s are a mix of Sovtek and GE, the 12AU7s are Sylvania. Both channels tested clean to about 9W into 8 ohms, both channels driven. The only electronic issue that we identified was a channel imbalance in the volume control. We opted to replace the volume control with an Alps “Blue Velvet” control. The channel balance of the volume control is now excellent. Slight drift in the balance control, however, results in the need for the balance control to be shifted just slightly to the left of center for ideal performance. Ownership: Second Owner Connections: RCA, Speaker bidning posts. Ground screw down terminal General Sound: Smooth, uncolored, undistorted natural and clean Cosmetic Condition: 8/10 = Very Good. Excellent front faceplate, one minor flaw on chassis side or top. Working Condition: Working perfectly and tested in our lab and listening room. Included: Unit, manual, and power cord. Packing: Will be packed using our highly developed in-house process and custom packing materials. Specs: Tube Complement: Four ECC83/12AX7 Four EL84/6BQ5 Two EZ81. Maximum output power: 14 WPC (11.5 dBW) continuous into rated load. Frequency response (at 1 W into 8 ohms): 10 Hz – 100 kHz, ±0.5 dB. Tone control range: ±15 dB at 50 Hz and 10 kHz. IM distortion (60 Hz and 6 kHz at 4:1): 2% at 14 W, 0.05% at 5 W. Sensitivity (input for 14 W): Moving Magnet Phono 4mV Tape head 2mV Mic 5mV Aux and Tuners 500mV. Speaker Connections: 4, 8, 16, 32 ohms. Dimensions: 15″ (385mm) W 4-3/4″ (120mm) H 10-1/2 (270mm) D Weight: 24 lbs. Testing Process: 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 a modern Amplitrex AT-1000 Professional 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 1 KHz test signal, slowly increasing 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 1 KHz square wave check and a 20 Hz to 20 KHz 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 minimum. 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. 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. Music Reference RM-5 MK II Tube Preamplifier with Phono. WyWires Silver Series Phono Interconnects – 5 Pin DIN w/ XLR Connectors – 4ft. Music Reference RM-9 Tube Amplifier With EL34′s.
Used McIntosh amplifier in very nice condition, no bubbles, clean face, sounds lovely with a mix of vintage tubes – McIntosh, Telefunken, and other brands. One guide pin is broken on a tube, but it still functions. Normal wear and tear expected with a 60-year-old vintage unit from the original owner. Please review the pictures and ask any questions before purchasing.
THIS WAS FOUND AT AN ESTATE AND HAS NOT BEEN USED FOR YEARS. THE FEW TUBES I TOOK OUT WERE ORIGINAL EICO. ONE OF THE METAL TUBE COVERS DOES NOT SEEM TO FIT ON THE TUBE RIGHT BUT WILL BE INCLUDED WITH THE AMPLIFIER. IT IS AS SHOWN. PLEASE LOOK AT ALL PHOTOS AND ASK ANY QUESTIONS YOU MAY HAVE. REMEMBER THAT I SELL MOSTLY ANTIQUE AND VINTAGE ITEMS AND THAT THEY ARE MOSTLY LIKELY NOT BE PERFECT DO TO THE NATURE OF THEIR AGE. IF YOU HAVE A PROBLEM PLEASE CONTACT ME BEFORE LEAVING FEEDBACK.
Pair of Scott 210F mono integrated amps. (You can watch a video on restoring these from Blueglow Electronics on YouTube). These should be gone through and recapped by a tech as any 60+ year old amp should be. The bumble bee caps are the later Mylar versions, which many say last well and don’t need to be replaced but that’s up to the restorer. Listed as for parts or not working just because it needs two power tubes and restoration but the transformers are tested as good. Amp 1 has all telefunken 12ax7 and 12au7 tubes but is missing the EL34 tubes. Amp 2 has rca 12ax7 and 12au7 tubes and Sylvania EL34 tubes. Amp 1 is missing the bottom plate screws so it is taped on. There is one missing resister in amp 1 underneath the power tubes but it will work once that is replaced. I will double box these and pack them carefully so they arrive safely.
