manufacture date of 6sn7's
I have recently aquired a box of old 6sn7's g, gt, gta, gtb and have no way to figure out the manufacture dates. A couple of examples: ge ff 188-5 and raytheon 280 2-17. Is there anyway to decipher these numbers - is a reference book that covers this available? Thanks in advance for any help.
ph
I have recently aquired a box of old 6sn7's g, gt, gta, gtb and have no way to figure out the manufacture dates. A couple of examples: ge ff 188-5 and raytheon 280 2-17. Is there anyway to decipher these numbers - is a reference book that covers this available? Thanks in advance for any help.
ph
Is there anywhere that gives any clues as to what "Tube Lore" contains?
It's basically the last word in trivia about many tube types, mostly American. Well worth the money.
John
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