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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Re: Resistor Value

Posted by Russ57 on January 22, 2004 at 11:05:16:
Okay, I don't know what amp you have so it's always possible that my "guess" is incorrect.
But usually a resistor of that value from cathode to ground is merely for measuring voltage drop across it to set bias. Can you adjust the bias on your amp? If so for each tube independtly or only for a pair or only for a quad of tubes? What is the bias supposed to be set at? With that info one can then calculate actual wattage needed. The formula is wattage = (amps squared)times resistance. I like to keep the wattage as small as possible so that the resistor acts as a safety fuse in case something goes wrong. If your amp has a one resistor for each 6L6 then 1/4 to 1/2 watt metal film is what you want. Amp makers put big ones in so they won't blow. IMHO it's far better to have a resistor blow than to ruin a transformer....even if it blows for no good reason now and then.

Russ