Tubes Asylum

Plate voltages

63.247.31.12

In Reply to: RE: pink ceramic based STR-415 (Sylvania specials) posted by Thermionic27609 on July 07, 2009 at 07:16:40

Yeah, but a lot of amps run plates at high voltage. I remember working on a CJ monoblock that ran a hefty voltage on the 6CG7. Gotta be sure that the cathode resistor/bypass caps are within tolerance, so the current draw is ok. And coupling caps are ok.

BTW... if you drop the plate voltage, sometimes the great headroom of the amp kinda goes away. As well as the crunch in the overdrive. Anyhow, need for quiet gain stage tubes (esp the first stage) is a must. I like BP RCA 7025 or Euro (TFK or Philips made) ECC83 in that position. They give nice overdrive and stay quiet, despite the crazy abuse.

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