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Scotland · January 19th, 2004, 07:58 AM

When do you re-bias an amp ? Is it when you re-tube with pre-amp valves or output ones.....or both ?
Thanks,
John.

Tom P. · January 19th, 2004, 10:31 AM

for power tubes, not necessary for preamp swaps.

Scotland · January 19th, 2004, 10:43 AM

Quote:

Originally Posted by Tom P.

for power tubes, not necessary for preamp swaps.

Thanks, that's what I wanted to hear !

jjmantele · January 19th, 2004, 10:26 PM

Also not needed if your amp's power section is cathode biased.

January 19th, 2004, 07:58 AM	#1 (permalink)
Scotland Poster Extraordinaire Join Date: Mar 2003 Location: Aberdeen, Scotland, Yewrup Age: 55 Posts: 7,428 3 Photos	Bias question When do you re-bias an amp ? Is it when you re-tube with pre-amp valves or output ones.....or both ? Thanks, John. __________________ All those who believe in psycho-kinesis, raise my hand !

January 19th, 2004, 10:31 AM	#2 (permalink)
Tom P. Tele-Holic Join Date: Mar 2003 Location: Eastern Ct. Posts: 909	Rebias.. for power tubes, not necessary for preamp swaps. __________________ Just Pickin'

January 19th, 2004, 10:26 PM	#4 (permalink)
jjmantele Tele-Holic Join Date: Aug 2003 Location: New Jersey Posts: 903	Cathode bias Also not needed if your amp's power section is cathode biased. __________________ JJman If it says "Vintage" on it -it isn't.