• 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.

Help with Mullard 5 20 project

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Hear hear mr Junk. Actually what I do re the rectifier is to use UF1007's and then feed the output of the SS section to a 5AR4 (both plates in parallel) or TV damper tube plate so as to obtain the soft start and tube dynamics. Since the 5AR4 is being run in parallel a single unit can run your stereo unit. Also a tool to consider for taming the output iron is running local feedback from the primary to the phase splitter plates. I'm listening to a McIntosh MC2100 transformer set that is running with power MOS complementary output source followers. Of course the power MOS is being driven by frame grid cathode followers and a pentode voltage amp.
 
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