I recently replaced RCA cleartops with a pair of NOS Telefunken 12AU7 (ECC82) tubes in my Cary gear. The difference was very substantial with much clearer extension on both ends and wider soundstage. I have tried a few other tubes before the RCA, but the RCA was better than most of them till the Telefunken.
Tubes for VTL 6.5Series II Preamp
My VTL preamp has about 400 hours of play on the tubes. So I’ve given it lots of time to break in. It is unbelievable how it performs, opens the soundstage, adds clarity and blends perfectly between my Brinkmann Nyquist DAC and Decware 6watt amp. Anybody have any suggestions on tube rolling? It uses 2 12au7s. Thanks,