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?
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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.
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.