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I'm a newbie tube roller and want to switch out the 6922EH in my ARC LS1 with a 6922/6DJ8 and came upon this ad:6DJ8.(4)AMPEREX BUGLE BOY USED/TESTED,"O" GETTER
Made in Holland,nice BB logos.They test 97/92/62
83/80/62, 84/94/62, 72/76/62 on a TV-7D/U..$20ea
What do those numbers mean and is that a good price, thanks.
Follow Ups:
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The TV-7 tests with a different scale and not in micro mhos, as many testers do.Most probably the third number, 62 is the minimum throw away reading for that company and that tester. Usually testers operate at a 60% or 65% percent level as the minimum a tube should be at, prior to replacement. My Triplett 3423 has a 65% min. and this throw away point should be stated in the ad.
Next, the 6922 family is what is called a 'dual triode' or 'double triode' meaning that it has two independent and equal halfs to it, so those first two numbers are the readings of each of the two triodes. Ideally, these match perfectly, but say 10% is good. Now, if you knew what percentage 62 is, you could determine the number that represents 100% of a tube's emissions.
My 65% number for this tube type on my Triplett tester is 7500, so 11,538 represents 100%, or a theoretically NEW (NOS) tube. Assuming that 62 is 65% on this fellow's TV-7, than 95 would be a 100% tube. If 60%, than 103 would be 100%.
As you can see, the first tube's two triodes, while not matching exactly, are both near or above 100%, so it's a pretty fresh tube. The other three are in the 80s or 70s and hence, are not.
Remember also, that a tube can test near, at or above 100% and still be noisy or microphonic. The only way to determine that latter two issues is to plug it into a circuit and listen.
Chris
my 65% for the 6DJ8, which differs slightly from the 6922/7308, is really 8200, so 100% would be 12,615. This does not affect the numbers I gave you, however.Chris
as in a relable.....I only buy from a private party if it's the same amount as going to see a concert, cuz they could have a bad night and the money is just as gone....try and by from a reputatable dealer, the AA sponsor list is a good place to start, and I have had decent luck with the Sovtec 6922/6DJ8 and the 6N1P. Another option is to buy from a gear manufacturer (like ARC),and alas, through an audio saloon, who uses that particular number. Not cheap, but you will get tubes that are the cream of the crop....they test for DOA, then burn in and retest before OK-ing the tube. And you will have some recourse if FED/UP crashes the truck with your package in it, and the things toast after an hour.....
Dutch Bugle Boy 6DJ8s are pretty common and many are pulls from scopes and other scientific equipment going way back. I would pass on those tubes at $20 a piece. The first one might be worth $10 if you have to have it.Chris
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