2. tech-talk
  3. 1252382971

Matched Tubes do I need them and why?

I have purchased a tube pre amp that has two 12aux7 and two 12 au7's for tubes. I would like to upgrade these an am wondering, do I need matched pairs of each? or do I just need to by new ones. I can get new for about 20 bucks, but have been quoted 110 for matched.

Please let me know what ya think and my apologies if this has been discussed before. Not much time to surf these days.
Thanks for your help.
ghost_rider

Showing 2 responses by ghost_rider

ghost_rider OP
117 posts
 
Thanks for all your help, but how can I tell it is a matched set. Are the numbers on the side to be exactly the same? Some ratings on tubes show Idle and Dynamic db while others show T1,T2 and GM for each. If anyone knows of a web page I can get a good education in that would help. At any rate I am having some fun with tubes. Just bought a pair (hopefully matched) of RCA command's and gonna plug them in tonight.

Cheers,
ghost_rider OP
117 posts
 
Thanks for all the responses. The unit I am referring to is a P 307 Grant Fidelity http://grantfidelity.com/site/P307. In answer to your question I want the two channels to sound the same and correct. How do I ensure I am getting matched pairs. Are there specs on the boxes showing testing results are the same for each tube?

Again thanks for all your help.
More to discover