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RE: 6as7 "preamp".

Thanks. It was a academic question. The 6AS7 has way too much input capacitance for my taste. Just wondering. 25 watt wirewounds are relatively cheap and dropping 90v across them would not be a problem. 90 volts across a 1.2 K plate resistor. 70v plate to cathode for the 6AS7 and 20v across a 250 ohm on the cathode all @ 80 mA. It would make a hell of a buffer but rolloff in the highs would be bad.

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