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FDP Forum / Fender Amps: 1985 - Current / Installing new Groove Tubes in my Fender Twin, do I need to bias them?

Revelation Sound

Pennsylvania, USA

Jul 31st, 2018 01:11 PM   Edit   Profile  

I ordered 4 new 6L6 tubes from Fender. Should I have them biased or since they are the same tubes. I don't have to?

(This message was last edited by Revelation Sound at 03:12 PM, Jul 31st, 2018)

Hammond101
Contributing Member
**********
**

So. Cal. USA

Jul 31st, 2018 02:13 PM   Edit   Profile  

One of the things you pay extra for in a GT tube is a rating you can match up so bias adjustments are "technically" not needed.

I however like to check it every time power tubes are changed in a fixed bias amp like a Twin Reverb. For one you are checking the tubes to insure they are operating correctly and you are checking the amp to insure the bias/power section has not drifted from spec.

I check bias in my tube amps annually give or take even if tube are not being replaced.

Big Joe

USA

Jul 31st, 2018 04:32 PM   Edit   Profile  

Yes

Big Joe

USA

Jul 31st, 2018 04:32 PM   Edit   Profile  

Yes

Revelation Sound

Pennsylvania, USA

Jul 31st, 2018 04:32 PM   Edit   Profile  

I have a meter but I don't know how to test the amp. There are no inserts in the back for checking the tubes bias.

FDP Forum / Fender Amps: 1985 - Current / Installing new Groove Tubes in my Fender Twin, do I need to bias them?




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