GE 6L6GC bs RCA

I ran a GE NOS 6l6gc against JAN Philips 7581a cryo and Svetlana Winged-C cryo. It was no comparison and ever since I save the money on NOS tubes

I have a quad of the coveted RCA black plates from the 60s. Cost me a bunch. New Tung Sol 7581A walk all over them for 1/3 of the price.

If you can run them Golden Lyon KT66, is a pretty good valve. 

Unless you have a good set of RCAs Most are gone. I have two sets of Mcintosh RCAs 6L6s very VERY special.

I have a quad of Telefunken EL34s VERY special..

GL KT66, I was impressed.. re-issue Tung Sol 7581, reminds me of the old RCA BP. My Carys sure like them..

One other strong performer is the Tungsol KT66. It draws filament power in accordance with 6L6 spec, has the heavy KT66 glass and gives a great sound: mellow, articulated bass and sweet treble.