• 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.

EAR509

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I'll try this
 

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No, but we've both met the chap who designed it. We can reliably claim that he would oscillate between spitting mad at your puny attempts to clone his wondrous creation and sneering at your pitiful output transformers.

Seriously, it's often been said that the tricky bit of a valve amplifier is the output transformer, and never more so than in this design.
 
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