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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
mofimadness's avatar
mofimadness
4,943 posts
 
It really depends on how they are used within the preamp, (for what purpose). I'm guessing (2) for the line stage and (2) for the phono stage? Then, yes they need to be matched. What make and model of preamp is it?
darkmoebius
900 posts
 
Depends on the actual circuit design of your preamp. Sharing the manufacturer and model of your pre will help others in answering your questions
elevick
2,636 posts
 
Yes, you can get a decent pair for $20. Just buy from a reputable dealer: Upscaleaudio.com, echohifi.com and many more. tubesandmore.com used to match basic tubes for something like $1 extra.
jimjoyce25
215 posts
 
Do you want the two channels of your system to sound the same or different?
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.
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