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I have used the Winged C EL34 6L6GC and 6550 they were all very consistent and reliable.i have a quad of very rare Winged C early manufacture 6C33C-B triodes and I run a pair of them in my 18 wpc SET amplifier and they sound better than any Ulyanov 6C33C-B triodes that I have tried.
Anybody have any ideas / sources on where to get a pair or two of these Svetlana "Winged C" 6C33C-B tubes?? Looking for a reliable source for these!