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ok here you go
you have
50l6=pentode
12sk7gt=pentode variable u
12sa7gt heptode year 1941
12sq7=duo-diode+triode circa 1939
Cheers
ce24
BTW I have no idea really what those mean I just have a really cool piece of software that you just type in the tube numbers and it gives all the data, pin outs etc....
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