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RE: It is not just the cap, the load matters as well, and the ST70 is very "loadie"

"Wonders" might be a little bit of hyperbole but dual rectifiers and beefed up PS would be a big improvement. Or, if you're not committed to 100% tubes, go silicon for the rectifier with due precautions for higher B+. Dave Gillespie covered the SS route in some detail @ Audio Karma a while back. Worth checking out!

P.S. Don't mean to imply a stock ST70 can handle 2x5AR4...PT isn't up to addl filament load. Just that ideally, dual rectifiers would have been the way to go at the time. SS can be done with the stock PT.



Edits: 07/11/14

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