rebias guitar amp if using same tubes???

maddnotez · 3rd March 2011, 02:00 AM

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?

phaselag · 3rd March 2011, 02:11 AM

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

jjman · 4th March 2011, 02:14 AM

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?

3rd March 2011, 02:00 AM	#1
maddnotez diyAudio Member Join Date: Feb 2011	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?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
1.2W guitar amp useing:6N2P and 6N1P russian tubes.	AnalogSound	Tubes / Valves	0	4th July 2010 11:36 AM
Any 100W DIY Tubes Guitar Amp ?	willycom	Instruments and Amps	9	24th July 2007 09:08 PM
Good Source for NOS tubes for guitar	Daveis	Instruments and Amps	1	29th May 2007 02:09 PM
Riviera 725 guitar tubes amp	Jeffy74	Tubes / Valves	1	10th October 2004 07:15 PM
low voltage tubes (space charge, etc.) for guitar amp?	needtubes	Tubes / Valves	4	31st October 2003 12:45 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

3rd March 2011, 02:11 AM	#2
phaselag diyAudio Member 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

4th March 2011, 02:14 AM	#3
jjman diyAudio Member 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?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)