On 5/27/13 9:25 AM, Nick wrote:
I have never seen a guaranteed-no-ambiguity-absolutely-certain-NOS B7971.
Its known that when the tubes were swapped out from Ultronics panels that
the removed tubes were normally fine (never seen a failed B7971 either) and
placed into the expanded polystyrene packing that the replacements came in.
The cynic in me says that the reason that the tubes have no markings is
that they've been washed to make them really clean, but of course, I could
be wrong...
At USD 175 per tube, they'd better be something special.... I've got quite
a lot of these out in the field and in 15 years have never had one fail -
my oldest clock with these is over 20 years old and all the tubes tick
along nicely with no sign of aging.
Nick
Thanks for bringing that up. The only way to know a tube is new is to...
well... I don't know. A lack of discoloration on the insulator would be
a good sign.
The lack of markings is a big red flag. All factory tubes that pass
inspection are printed with their part number, to make them ready for sale.
The date code is less certain, as I have a pile of unused ITT 5870 tubes
with no date codes. When I bought a hundred of them from Richardson,
they got printed with a 2002 date code! Later, when I bought them out,
they shipped the tubes in the original bulk styro trays. How do I know
they're not used? Because they have long leads.
So, as usual, NOS is most likely to mean "Used tubes in the original
packing materials of their replacements from 40 years ago".
--
David Forbes, Tucson AZ
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