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Original Message
RE: Pretty boxes..
Posted by twystd on June 5, 2017 at 19:22:22:
I agree the ST-70 is not the best, about the only thing that is really pretty good is the output transformers. I rebuilt my brother's ST-70 using the K&K mod (transformer phase splitter, 6n23p-ev differential driver stage, and differential power stage using NOS 6s3p-e tubes), shunt regulated power supply, and beefed up power transformer, run in triode mode, no negative feedback. Not much ST-70 about it anymore other than the chassis and output transformers. Sounded PDG.
twystd