Description:

Pair of NIB GE JG-5751 triple mica black plate military tubes.Test
1250/1325 and 1450/1450 where new/nominal is 1250 gm and minimum is 812
on calib. Hickok 533A tester.

Question:

5751 being mil spec do you have an idea why they would test so differently?

Answer:

Yeah I do: Mil-spec doesn't imply matched sections, in fact it doesn't
really imply anything. The 5751 is less noisy and microphonic than a AX7.

You should really understand that you couldn't hear a difference betwen
tubes that were say 950gm and 1500gm.

Just the result of tube dealers trying to one up each other etc..

mostly a bunch of crap.

Theoretically you want tubes relatively close in gm so they get used at
the same rate and last as long as possible, but it's not reality. They
NEVER wear evenly, so again it's just BS.

Perhaps you can enlighten some others in your situation of these
realities. BTW: those tubes test about as good as they get 1250 is high,
sometimes new 5751's only test 1100, so those should last as long as
anything if you follow, (or have the probability of doing so.

Reply:

Your detailed response debunking some of the myths surrounding tubes is
very much appreciated. I will keep an eye on your auction and place a
bid if I can afford to.

Thanks