Tube Noob needs some help.
Old 23rd April 2012
  #1
Gear nut
 

Thread Starter
Tube Noob needs some help.

I recently have been getting ready to test out different preamp tubes for my guitar amp.

The V1 slot is the only one I have messed with. It takes 12ax7, I had a JJ brand, now chinese brand and love the difference. Now I want more options

My question is this. wtf is a 12ax7 jk

I see there are different types and I want to be very safe with my amp.

Im looking on ebay and see 12ax7, 12bz7, 12ua7, ect, ect many many others.


What do they all have in common? They start with a 12 and end with a 7.


Does all the mumbo jumbo in between mean anything at all to me???

If I toss in a 12bz7 instead of the 12ax7 is that going to work for me?

Someone please explin this
Old 23rd April 2012
  #2
Lives for gear
 

Myles Rose at guitarampblueprinting dot com is the best resource for what tubes to use where in a guitar amp.
Old 24th April 2012
  #3
Gear nut
 

Thread Starter
Quote:
Originally Posted by Bill@WelcomeHome View Post
Myles Rose at guitarampblueprinting dot com is the best resource for what tubes to use where in a guitar amp.
got the same answer on rig talk, is that you ???


I read it and it did help....

But it didnt specify my question.

Can you use any 12xx7 tube?? as long as it starts with 12 and end with 7?
Old 24th April 2012
  #4
Lives for gear
 

Vacuum Tube Basics

In a sense yes you can use any 12xx7 but it will not be ideal. Although they are pin compatible the characteristics of the tubes will be different, their gain, internal resistance, optimal bias point, etc.

My advice would be if the amp calls for a 12ax7 then try different brands of 12ax7 first, you will get a lot of tonal variety this way
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