Only preamp tubes need rebiasing right..? A question inside.

[Pierre]

Only preamp tubes need rebiasing when replaced right? I'd need to replace ALL the tubes in my amp, but I only ever use the power amp (there's a POD through the effects return). If so, I could just buy the 2 new power tubes and place them, and all noise should be gone when playing through the effects return right? Thanks

[dd12939]

Re: Only preamp tubes need rebiasing right..? A question inside.

You have it reversed - only POWER tubes need rebiasing. AFAIK, you can swap preamp tubes all you want without any other modification.

[Pierre]

Re: Only preamp tubes need rebiasing right..? A question inside.

DAMN!!! *goes kill Brent* Thanks dude!

[shredaholic]

Re: Only preamp tubes need rebiasing right..? A question inside.

Noise can be due to other things like ageing electrolytic filter caps, but it's more likely to be tubes. Just something to consider if it's an old amp.

[lex666]

Re: Only preamp tubes need rebiasing right..? A question inside.

Question: If you buy a pair of "matched" power tubes, does your amp still need to be re-biased?

[greendy123]

Re: Only preamp tubes need rebiasing right..? A question inside.

Yes unless you get the same tubes based on a scaling system like groove tubes has.

[Zhangliqun]

Re: Only preamp tubes need rebiasing right..? A question inside.

It's a good idea to occasionally rebias the amp while the same tubes are in them. They can drift after a while.