Vintage Tube Amp

I offer for sale an old Tesla amplifier. The device has not been used for many years, it is in mint condition. I did not turn on the amplifier from the mains to avoid damage. Please see detailed photos and video before purchasing. One potentiometer is damaged. I can send schematics and manuals in Czech language electronically. KZ 8 TESLA 513000. Description: Amplifier for amplifying acoustic frequencies supplied by a microphone, gramophone record, photon of cinema equipment, etc. Either one larger or several smaller speakers can be connected. Basically, it is a four-stage amplifier with a symmetrical output stage. A special pre-amplification stage is built in for the photon. By changing the frequency response with the control elements, the amplifier can be adapted to each type of transmission in order to achieve a high quality of reproduction. The amplifier can be used both in the home and in industry and in various establishments. At home, it can work as an amplifier for a record player, so better reproduction can be achieved than with a radio receiver. In industry, various uses can be found where the sensitivity and power of the amplifier are sufficient, for example during various measurements, checks, in laboratories and in operation. For small telephone transmitters up to 15 to 20 W, the amplifier is used as a very good modulator. Rated output power/voltage: 8W/100V. Power supply/power: 110, 120, 150, 200, 220, 240V / 70W. Tubes: 6F31 (photon preamplifier), 6BC32 (micro preamplifier), 6BC32 (mixer), 6CC31 (phase reversal), 2x6L31 (final stage), AZ12 (rectifier). I’m sending all over the world!! If you have any further questions, please write to me.

Bogen Db230A 1950s Vintage Tube Amplifier. Note : Only tested to power no further testing done. Does Not Include : any accessories. CHECK PHOTOS FOR MORE DETAILS. We describe AS-IS products to the best of our knowledge, but can not guarantee the operation of any parts included in this sale besides the fact this unit was tested to power only.

Vintage 1950′s Premier Twin 12 tube Amplifier Chassis project. Measures 18 X 5 1/2 X 3.

Vintage 1950s AMPEX type 6450 DUAL HIGH VOLTAGE SUPPLY Ampex Tube Preamplifiers, removed from old obsolete rack cabinets during interior demolition work of Movies Screening Room in former 1950′s TV Station building on Manhattan’s West Side. Super heavy: 28 Lbs. Condition: used, transformers seems are working. It has Not Been Tested with radio tubes (we don’t have original tubes), quite old, tons of dirt. Removed from some sort of amplification farm cabinets. Original screws and vacuum bulbs had been missing during demolition. Pilot light is not working. No original tubes Included!!

Overall condition is good- no damage, just some dust, rust, and patina. All tubes are include aside from the four 6550. This is the most robust and powerful amplifer ever made by Western Electric / RCA. These were designed as monoblock amps, class AB, made to power Voice of the Theater speakers, and the like. These are extremely hard to find in recent years, their price and value ever climbing! This will be packed with exquisite care, using double-walled boxes and robust foam wedges and blocks. Tubes will be removed and packed separately, everything with ample protection. Please also feel free to message me if you have any questions.

Vintage Hammond H-AO-33-1 tube amplifier. Taken from a working unit, cosmetically in good shape – a few inside components appear corroded but mostly clean (see photos).

These were pulled from vintage equipment, have drifted in value, and show some DC leakage. As such they are being listed as not working even though they still might be usable in lower voltage applications. I randomly measured exactly a third of them (20 out of the 60) with my Fluke DMM, and the average value reading was 0.136mfd. These all came from the same source so it’s likely the others will measure around that same range.

1950s Collins 356B high gain tube preamp or program / monitor amplifier. Same circuit as the Langevin 117a. The original, excellent, ADC transformers are guaranteed but this unit has been untested and the original capacitors must be replaced before applying power. Fantastic preamp for high gain use (ribbon mics, etc) once restored. Datasheet, schematics and test harness included. Tubes included but untested.

Vintage Early 1950′s Newcomb 6 Watt Amplifier Great For A Harp Player or Guitar player. Vintage early 1950′s Newcomb 6 Watt Amplifier in excellent condition. This fine amp sounds wonderful with an electric guitar or harmonica! This amp comes from a collector, which explains the excellent condition. All said, this is a great vintage amp looking for a guitar or Harp player!

The unit still powers up, and the turntable functions on all speeds. The only problem is when it’s switched all the way over 78, the turntable makes a scraping sound. I’m not sure if it’s missing anything for the tone arm rest. It could be similar to some of the guitar amplifiers they made. It’s in pretty good cosmetic condition, as you can see. There is one wear paint spot on the left bottom side. Otherwise, it’s in very good condition. I imagine this could be converted to a fine guitar amplifier.