• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Gold mine of DI¥ audio tubes schematics from Japan

Love the minimalistic look. Obviously only a Japanese wife will learn the safe power-down sequence. Or how to turn the volume down without upsetting the filaments :D
 

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300B :up::):wrench::bulb:
 

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:cheerful:
 

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Ex-Moderator
Joined 2011
What is it called in Japan? Could someone point to a Japanese explication of this .....in English of course.
This type of circuit is called 4DC by Soya Susumu, who popularized the design going back more than twenty years, unfortunately there is no English translation of his work, nor is there any full article shown in the MJ archive - since all the scanned articles have a few important pages missing. :mad: