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cacheek
New member
Do you have to rebias every time you change tubes? If not, when is it not necessary?
stephen sawall
SEMI ERECT MEMBER
If all of the tubes - new & old are all matched / all rated the same you might not need to bias. The new and old all have to be the same / identical match.
Bias drifts .... If I bias a amp a week or less later it usually needs to be done again. As tubes are used the bias changes ... so if they start as a matched set - soon they are not often.
I bias every-time I change tubes and check them from time to time.
Bias drifts .... If I bias a amp a week or less later it usually needs to be done again. As tubes are used the bias changes ... so if they start as a matched set - soon they are not often.
I bias every-time I change tubes and check them from time to time.
LP Freak
Well-known member
Every time you change power tubes for sure. It's cheaper to be safe then sorry. Pick up a Bias Rite and it'll pay for itself in no time. 
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Buckeyedog
Active member
LP Freak":1ahxxmcf said:Every time you change power tubes for sure. It's cheaper to be safe then sorry. Pick up a Bias Rite and it'll pay for itself in no time.
Yep!
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mdc1mdc11
New member
highly recommend the compu-bias product...provides 3 critical values at once, Vp, Ik, watts
http://www.compu-bias.com/
http://www.compu-bias.com/