[Hallicrafters] Cold storage for vaccum tubes

[Mark Shaum]

I have not had a problem I can attribute to cold storage, the building
holding most of my parts (and tubes) never drops below 55F.  But I have
had sagging filament shorts when some tubes were stored in a horizontal
plane.  Keep them vertical especially the direct heater types.

Some tubes just have fragile filaments, that do not hold up over time,
likely due to their construction materials.  There was a good discussion
on this a few months back on the Boatanchors reflector.

73! - Mark, K9TR
----- Original Message -----
From: <Wa4uso at aol.com>


> Should I bring my 100th's and 250th's in out of the cold? Does
prolonged
> exposure to moderate cold temperatures cause the filament structure to
become
> brittle? Case study, I brought in two NIB RCA 808 triodes from the
cold, let them
> sit for a day, carefully brought the filaments up to the correct AC
level and
> within one hour of testing the filaments they had disintegrated and
fallen to
> the bottom of the tube.