Vintage Tube Amp

Vintage Rare Ampex 6973 Stereo Tube Amplifier Amp Refurbished Very Good Condition. This is a very hard to find 1960 Ampex 6973 stereo tube amplifier, it is a power amp and requires a preamp to drive it. It uses 2 – 7199 and 4 – 6973 output tubes, all 6 tubes are vintage RCA tubes (3 of the 6973 tubes are labeled “Knight by RCA”). There are two input level controls which allow you to adjust/balance the input from your preamp. There is also a balance (hum) control for each push-pull output tube set accessible from the top of the amp. There are screw terminals for the two speakers (8 ohm) and also screw terminals for a power-on indicator lamp. The ac power is fused. There are standard RCA jack left/right inputs. The 7199 tubes test strong and the 6973 tubes still sound great, but will need replacing at some point, 2 of them test weak (right channel). I replaced all of the electrolytic and paper capacitors in the amp for long term reliability. I checked all resistors to confirm they were within tolerance and replaced 2 that weren’t. One of the output balance controls was intermittent, so I replaced both controls with new Clarostat controls. I also replaced the two silicon rectifiers with higher rated new ones for future reliability. I replaced the two safety capacitors (AC line to ground) with modern replacements. Other than some of the power supply caps are slightly larger in value, I did not modify the circuits in anyway. Rework is professional level. I added two terminal strips underneath to securely hold the new capacitors. The original capacitor can is no longer used, but was left to maintain the original appearance of the amp. Please make that decision before beginning any modifications to the amplifier. The item “Vintage Rare Ampex 6973 Stereo Tube Power Amplifier Amp Refurbished VG Condition” is in sale since Wednesday, February 21, 2018. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “ellenroselillian” and is located in Hastings, Minnesota. This item can be shipped to United States.

• Brand: Ampex
• Type: Power Amplifier
• Model: 6973 Stereo
• Country/Region of Manufacture: United States

Mono block power amps removed from an AMPEX hi-fi console made in 1960, they have been rebuilt and are mounted on a custom solid walnut platform. Both have the stock TRIAD power and output transformers. The power supplies have been completely rebuilt, a few coupling caps were replaced with IMB type, high voltage caps replaced with Solen type, new power switches installed, a few resistors replaced, and both have new grounded power cords. Power tubes: EH-6973 x 2 EF86 12AU7 6CA4. Both are in perfect working order and have very quiet noise floor, output power is a little over 10 watts RMS at clip per unit, at 1Khz into 8 ohms. The item “Pair Of Restored Vintage Ampex 6973 Mono Block Tube Amps from 1960 hi-fi console” is in sale since Friday, December 08, 2017. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “djlvideo” and is located in Greensboro, North Carolina. This item can be shipped worldwide.

• Brand: Ampex
• Model: 6973
• Type: Power Amplifier
• Country/Region of Manufacture: United States