DIY Push-Pull (PP) 6V6 Tube Amplifier Schematic
Brad S.  
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DIY Push-Pull (PP) 6V6 / 6V6GT Tube Amplifier with Hammond Transformers
DIY Push-Pull (PP) 6V6 / 6V6GT Tube Amplifier Schematic
This 6V6 amp was built following the push-pull (PP) EL84 / 6V6 Dynaco A-410 output transformer schematic. There are a few minor deviations from the original schematics. Instead of Dynaco transformers, Hammond 1608A audio output transformers and a Hammond 272HX power transformer were used. A 5Y3 rectifier would have been too small for a stereo amp so a JJ GZ34 rectifier was used. It became necessary to put a 100 ohm resistor before the first power supply capacitor to bring down the B+ to about 325 volts as I was getting in excess of 345 volts (there is less voltage drop through a GZ34 versus a 5Y3). For more information about tube power supply design, see Matt's informative article Power Supply Design for Vacuum Tube Amplifiers.
I am planning to replace the 100 ohm, 10 watt power supply resistors with 20 watt resistors. The 10 watt resistors run a little to hot for my taste.
6SL7 driver / Push-Pull (PP) 6V6 / 6V6GT Tube Amplifier Schematic
The driver tubes are Tung-Sol 6SL7GT and the output tubes are Electro-Harmonix 6V6GT. The amplifier really sounds wonderful with nice detail and plenty of bass response. Power output is about 10 watts per channel.
