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

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.

used as driver tubes on Wavac Ec300b in front of EAT and Takatsuki 300b. The KT66 works best with EAT, the Sylvania Winged-C best with the latter