Description

For sale is this good tested tube amplifier power transformer, its 7 1/2 pounds, can output about 150 volt amps two 120V inputs, output 5V, 6.3V, 6.3VCT(white center tap), and 900VCT (at no load, 480VAC from each red to red/yellow center tap). Size about 3 1/8 x 4 1/4" x height 3 7/8" If you run the 480-0-480V through 2 diodes or twin tube rectifier to capacitor, you'd get 600DC, would be ok for pair of 6L6GCs or EL34s. You also can get close to 450VDC using input choke- transformer would run through 2 diodes, (no cap to ground yet), choke, then cap to ground with bleeder resistor (i.e. 1W 1meg). Needs a big choke. With perfect choke, you'd get 450VDC and 40% more usable current. Realistically with a 1 meg bleeder resistor, and under load, i'd except about 500VDC with solid state diodes, or about about 450VDC using tube rectifier like 5Y3GT 5AR4 5U4GB 6CA4. *There's one more choice to make lower voltages for 6V6GT or EL84 /6BQ5 quad (4 tube) amps: run 120V power to the 120V primaries in series, to half the output voltages. There are three 6.3V primaries, use two in series, to make 120V to 480VCT, and 6.3VCT, should be good for quad of 6V6GT or EL84/6BQ5s, they'd be running about 330 plate volts.