Vintage Tube Amp

For sale is a vintage General Radio Co. Model 814-A serial no. This vintage piece of test equipment was produced around 1937 for lab use. It has three mixed brand type 34 vacuum tubes. This piece is in decent condition for its age with many signs of wear and age. The gain knob had a piece about 1-1/4 wide broken out of the base when I acquired it. Luckily, the missing piece was inside, and I was able to glue it back together. The cracks are just faintly visible on the front (see photos). There are a couple small holes in the front right above model/serial numbers. I’m not sure if there is a badge missing or these holes were for. Otherwise, this piece appears to be complete. Nothing is obviously missing or altered. The cabinet is intact but most of the original finish has worn off. The underside of the top appears to have some staining from moisture. This staining from moisture damage covers about half of the paper schematic/instructions. The cabinet is just slightly loose at the bottom left corner joint (see last photo). Electronically, this piece appears to be pretty clean and in good condition. This piece originally operated on batteries. Please see all photos for condition and completeness of the item. I can provide additional photos upon request. Cabinet dimensions are 12-1/4″ wide (excluding handles) x 12″ deep x 8 tall.

Line isolated, “Universal” A-B-C Battery Eliminator / Power Supply for powering most vintage battery operated or farm tube radios. Front panel adjustable “A” (filament) Supply: 1.5. 9.0V with soft start – 2.0 Amp. “B” (plate) Supplies: +135V- 80mA, 90V – 60mA, 67.5V – 40mA, 45/22.5V – 5mA. “C” (grid) Supplies: -4.5/-9/ 22.5V – 2mA (“C” voltages easily user modified). “B” isolated from “A” and “C” supplies. Two LED indicators: one indicates power supply is ON, the other indicates radio is also ON and drawing plate current. For use as a universal bench supply OR to provide a permanent power source for battery powered tube radios. Small size (6.5 x 4 x 2.75) and light weight 28 oz. AC in: 85 – 265V, 50/60 Hz (USA plug type A). Operating temperature 0-35 deg C. Thermal overload and short circuit protected. Quiet (no fan, buzz or 60 cycle hum). Uses AC line and DC output common mode EMI filters. Includes User Manual and nine conductor cable (see photo). 3 Amp “A”, 100mA “B”, up to 270V “B” (using series connected eliminators) and/ or other A 1.25 – 9V adj. See separate listing under “Battery Consolidator / Voltage Converter” for similar device allowing mobile operation, operation without access to AC power (single battery required) or as a battery eliminator (using available linear AC/DC converter).

Line isolated, “Universal” A-B-C Battery Eliminator / Power Supply for powering most vintage battery operated or farm tube radios. Selectable “A” (filament) Supply: “A6″ (6.0 -6.5V) or “Ax” (1.25-5.0V)- 2.5 Amp. “B” (plate) Supplies: +135V- 80mA, 90V – 60mA, 67.5V – 40mA, 45/22.5V – 5mA. “C” (grid) Supplies: -4.5/-9/ 22.5V – 2mA (“C” voltages easily user modified). “B” supply capability can be increased 20mA by reducing “A” current from 2.5A and/or by reducing ambient temperature to 25oC (from 35oC). “B” isolated from “A” and “C” supplies. Two LED indicators: one indicates power supply is ON, the other indicates radio is also ON and drawing plate current. For use as a universal bench supply OR to provide a permanent power source for battery powered tube radios. Small size (6.5 x 4 x 2.75) and light weight 28 oz. AC in: 85 – 265V, 50/60 Hz (USA plug type A). Operating temperature 0-35 deg C. Thermal overload and short circuit protected. Quiet (no fan, buzz or 60 cycle hum). Uses AC line and DC output common mode EMI filters. Includes User Manual and nine conductor cable for neat connection to radio (see photo). 3 Amp “A”, 100mA “B”, up to 270V “B” (using series connected eliminators) and/ or other A 1.25 – 10V adj. Serial number will differ from that shown in photos. Search separate listing under “Battery Consolidator / Voltage Converter” for item allowing mobile operation (single battery required) or as a battery eliminator (using available linear AC/DC converter) for many vintage tube radios.

This is a very rare Airline 2535-V commercial grade tube amplifier unit. It is missing the record player which would mount on top but an orange metal plate was added on top. This unusual amp unit features battery operation with AC and DC power cords on the back. It appears that the large mechanism toward the rear of the chassis inside is a generator (Genemotor switch on the faceplate), perhaps the generator is to recharge an external battery (not included). The tube compliment going from back to front counter-clockwise are 83, 6F5G, 6F5, 79, 76 6L6, 6L6 all vintage including RCA and Sylvania (untested tubes). It measures approx 15″ wide, 16″ deep and 10.5 high. The item “Vtg AIRLINE Tube Phono Microphone Amplifier Amp AC/DC BATTERY GENERATOR RCA 6L6″ is in sale since Friday, May 25, 2018. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps”. The seller is “forasong123″ and is located in Longmeadow, Massachusetts. This item can be shipped to United States.

• Model: 2535-V
• Brand: Airline