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Old 3rd March 2011, 02:00 AM   #1
diyAudio Member
 
Join Date: Feb 2011
Default rebias guitar amp if using same tubes???

Hello, was hoping I could get some good input with this.

I just bought a used amp from a store. When they shipped they took out the tubes to protect them. They did label them so I know which tube is for what pot.

But do I need to check bias after I put them back in?

I would assume it was set properly in the first place, then you take out tubes for a few days and reinstall the same tubes. Not sure if that would throw anything off.

So far I have heard mixed answers, some say yes rebias some say ahh its ok youll be fine.

Sound is something I can tweak later on, right now the only thing preventing me from putting them back in and plugging in the amp is just that I spent a lot of money on the amp and am scared to do something to mess it up.

What do you guys think? Is it safe to go with out a rebias?
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Old 3rd March 2011, 02:11 AM   #2
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Join Date: Nov 2010
Location: N.E. PA
You are most likely safe. If it was adjusted prior, and the tubes are replaced in their original locations it should be fine. Changing/new tubes and aging in general are reasons for rechecking and adjusting the bias.

paul
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Old 4th March 2011, 02:14 AM   #3
jjman is offline jjman  United States
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Join Date: Jan 2009
Most probably they will bias to the same point they did previous to the shipment. Unless some damage occurred somewhere. But was that an appropriate level?
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