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.
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Read More Source:
http://www.dogstar.dantimax.dk/tubestuf/4x4howit.htm
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This entry was posted on Saturday, February 9th, 2008 at 10:03 am and is filed under Power Amplifier.
