Ummkay Guru's, tube question

[rat]

When replacing the finals, I know the tubes "are matched
in sets," but should the amp be rebiased? I thought only if you
went to a different tube this would need be done...:think:... Thx for your
input in advance......

rat

[charvel750]

You should bias no matter what because even tubes of the same brand and model variety can draw different current. Therefore, to be optimally set, you would need to measure the new plate voltage and adjust the bias from that draw to about 70% of the tube's full value.

[rat]

You should bias no matter what because even tubes of the same brand and model variety can draw different current. Therefore, to be optimally set, you would need to measure the new plate voltage and adjust the bias from that draw to about 70% of the tube's full value.

Thx 750, Being an electronic tech. I answered my own question
on another thread. I'm just not an amp. tech. and was afraid
of killing something...your input is gr8ly appreciated..
Voltage and current differences.......