• 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.

woohoo! RDH4!!!

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Another good reference book on amplifiers is "Amplifier Handbook" by Shea. (1966) There's a couple on eBay right now. (I have it)
 

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