• 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.

El34-kt88

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Would the stock transformers be adequate?

The output transformers will likely be just fine. The power transformer is barely adequate for four EL34, much less a quad of KT88. Forget about trying to use a single 5AR4 for power supply rectification.

Other than those minor issues, the conversion is straightforward. Bob Latino sells such an amp commercially. Perhaps you could look at his design and try to clone it.

http://www.tubes4hifi.com/bob
 
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