Indeed it is. I have tried several nos tubes including Amperex, Telefunken, Mullard, RCA clear tops, CBS hytron...etc.I find for my system the Amperex 7316 with 'D' getter gives me the cleanest, most pleasing sound.
Tube rolling in the Candela
Hi all. For the Candela owners out there-what do you find to be the best sounding 12au7 and all its myriad variations in your system and what tubes have you tried? Also, I just picked up a Telefunken ecc82 red tip date coded Berlin, 1956. Are the red tips some special designation like medical equipment?