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Originally Posted by andy
Aren't they just 6L6GBs with the plate connection moved to a top cap?
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Looks pretty close, though the pinout on the bottom is different beyond just the lack of a plate connection. There's also a 19GB6 with a 18.8V 300ma heater if you wanted to modify a hot chassis 25L6 based amp to become just like a 6L6 amp instead of a 6W6 amp (Tube manufacturers were not always consistant with the hXX# pattern in tube names in that a 6L6 was not the same as a 50L6 even ignoring the heater). However a 50L6 = 6W6 excepting the heater.
And a 6Y6 = 50C6 (not 50C5!) except heater. A 50Y6 is a rectifier...