Guitar Tricks Online Guitar Lessons

new tubes

Andrew Sa
Registered User
Joined: 07/01/02
Posts: 1,612
Andrew Sa
Registered User
Joined: 07/01/02
Posts: 1,612
11/16/2005 10:48 am
Ok, I'm going to change all of the tubes, pre-amp and power(although I changed those fairly recently).

I need to know, when changing pre-amp tubes (currently 12ax7's not looking to cahnge that tho...just new 12ax7's).
will it be necessary for me to bias the amp? if so, how? should I just take it to a tech? help me dammit!
[FONT=Century Gothic]Hope is when we feel the pain that makes us try again[/FONT]
Permalink
# 1
PRSplaya
Full Access
Joined: 09/19/02
Posts: 3,941
PRSplaya
Full Access
Joined: 09/19/02
Posts: 3,941
11/16/2005 1:25 pm
You don't need to rebias after changing the preamp tubes, only the power tubes. When changing the power tubes, alway's make sure you get a matched set. What amp are you changing the tubes in?
[FONT=Palatino Linotype]Tonja Renee's personal instructor[/FONT]

>HERE'S WHERE I AM NOW<
Permalink
# 2
Andrew Sa
Registered User
Joined: 07/01/02
Posts: 1,612
Andrew Sa
Registered User
Joined: 07/01/02
Posts: 1,612
11/17/2005 3:09 pm
a Laney vc 50 2x12 currently it has 6 12ax7's and 2 El34's...so if I were to cahnge the power tubes, how would I bias the amp?
[FONT=Century Gothic]Hope is when we feel the pain that makes us try again[/FONT]
Permalink
# 3
PRSplaya
Full Access
Joined: 09/19/02
Posts: 3,941
PRSplaya
Full Access
Joined: 09/19/02
Posts: 3,941
11/17/2005 3:33 pm
I think your amp is a non adjustable bias. The only thing you can switch on your amp is a selector switch that selects 5881 or EL34 power tubes. Just make sure that it is set to the appropriate setting, and replace with a matched set of tubes. Check with your manual or a tech to be sure though.
[FONT=Palatino Linotype]Tonja Renee's personal instructor[/FONT]

>HERE'S WHERE I AM NOW<
Permalink
# 4
Superhuman
Registered User
Joined: 04/18/05
Posts: 1,334
Superhuman
Registered User
Joined: 04/18/05
Posts: 1,334
11/17/2005 4:38 pm
I just retubed a Triaxis and a Simul-Class 2:90, emailed Bob from eurotubes.com and he gave me a detailed email on the procedure and reasons for choosing a particular mix of tubes. His prices are good and he is known for being an expert. Check him out.
Listen to Superhuman shred on MP3Unsigned
Permalink
# 5
Andrew Sa
Registered User
Joined: 07/01/02
Posts: 1,612
Andrew Sa
Registered User
Joined: 07/01/02
Posts: 1,612
11/17/2005 7:00 pm
thanks,will check bob out...
[FONT=Century Gothic]Hope is when we feel the pain that makes us try again[/FONT]
Permalink
# 6

Please register with a free account to post on the forum.

Register