Circuit Project Electronic

The unit is powered directly from the 120 volt AC line, with no power transformers. Filaments are wired in series, with the total adding up to 117 volts (35 + 35 + 35 + 12). The 35W4 forms a half-wave rectifier, which is filtered by a three-stage RC network. The B+ for the output stage plates and screens are taken from the second capacitor, and the B+ for the preamp and phase inverter from the third capacitor in the filter.

Related Links
More circuit about Power Amplifier
More Circuit about Amplifier Vacuum Tube
Push-Pull Class A 2A3 Stereo vacuum tube Amp
THE MAIN TUBE AMPLIFIER 4W
Power Amplifier Class A by Transistor
24 Watt Class A Amplifier by 2N3055

Read More Source:

http://www.dogstar.dantimax.dk/tubestuf/4x4howit.htm

Thank you.