I have the same pre-amp in my bedroom system and just love it! I prefer Telefunkens to anything else they last seemingly forever and have a very neutral/correct signature. Try the re-issue Mullard Groove Tubes (about $20) each , which should give a warm sound, if you prefer that. Another to try at reasonable cost would be Mazda (French, not Japanese car) chrome plated 12AX 7's from the 1950's/early 60's, as some folks literally rave about them also (I have yet to try them). You'll need to have some 6X4 rectifier tubes on hand, too (I use RCA's as they are readily available and of good quality). You are going to have lots of fun with this. By the way, there are lots of fakes out there, so be careful, especially when spending lots of money. East German Telefunkens look just like the real thing and are absolute junk. When buying telefunkens I prefer the used one's labeled DYNACO or FISHER as they are the real ones, and, since they are used, they are typically cheaper too. Happy Listening, you made a great buy!
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