How do I bias my Marshall head? help please,replacing tubes! - Jemsite
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post #1 of 2 (permalink) Old 01-09-2004, 08:35 PM Thread Starter
Join Date: Nov 2003
Posts: 74
How do I bias my Marshall head? help please,replacing tubes!

ok so i got a marshall TSL100 head, and i want to swap the stock svetlana12ax7's to JJ 12ax7's. What kind of biasing will i need to do, if any? and how? can anyone give me some tips on how to replace tubes, like your old tricks, im new with tube amps hehe

any input welcome and appreciated!
shreddervai is offline  
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post #2 of 2 (permalink) Old 01-09-2004, 09:34 PM
Join Date: Nov 2001
Location: Somerville, MA
Posts: 6,200
Preamp tubes need no biasing- direct swap. do it with the power off and while the tubes are cool and you should be fine. Just be careful not to bend the little wire deals coming out of the bottom and you'll be all set.

Power tubes, on the other hand, need biasing.

anyway, enjoy that amp- those tubes just kill in it.

Drew is offline  

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