I agree with Rfraudio. I just received my Amperex PQ 7308's for my Melos Maestro preamp. I swapped out the Sovtec 6922's for the 7308's and found a hugh differance in sound quality. Love the Amperex PQ 7308's.
Tube advice
I'm thinking about replacing the tubes in my x-10d (Musical Fidelity). Now I know nothing about tubes-I believe the type used is Philips 6922's-I got this from another news group.2 questions. 1.Does it have to be exactly the same serial number or is there a generic form which this number relates to and therefore others I can use? 2.Obviously I'm thinking about changing with more expensive tubes-I'd seen Telefunken mentioned-is it possible to make a major mistake with the more cash is better theory? I appreciate there may be a degree of subjectivity involved in the latter question. Any help appreciatted and thanks in advance, Ben