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Actually, 40uf total. I picked up one of these at a flea market in 1980 for $10. Totally stock, including tubes. All I had for a speaker at the time was a bookshelf speaker to play my guitar into. But I remember it being so loud I had to keep the speaker in the closet. The schematic is so simple. It reminds me of Ken Fischer's amps.
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IMO there is nothing wrong with a well filtered power supply. Most likely the designers wanted to eliminate any possibility of power ripple affecting the output during high gain. They may have done this to reduce the supply voltage to the tubes which in turn will produce gain compression faster in high gain stages.
In general the power tree starts with the highest voltages and proceeds to the lowest voltages in a chain: power amp to preamp stages. If the power amp voltage sags the preamp stages will sag. If power amp filtering is effective the preamp stages are unaffected. The preamp stages are low current and will have minimal effect on the power stage.
Experts correct me here it's been a while since I mucked with tube amps.Comment
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