[Hallicrafters] Cold storage for vaccum tubes

[Oliver J. Dragon]

Darell,

I don't have the answer but will note a couple of pre-solid state things:
The AM radios in automobiles of years ago used tubes and would spend hours, 
if not days in zero-degree temperatures without harm to the electronics. I 
would leave my car in that kind of weather for a week at a time before 
using it (and the radio).
Also, military equipment in the "old days" was usually spec'd to survive 
and operate in cold weather climates. They may have required some heat 
source to keep the ambient temperature above some lower limit, but I don't 
know if that was the case.

73,
Ollie.


At 01:41 PM 12/13/2003, you wrote:
>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.
>Your feedback in this matter would be appreciated  73  WA4USO  Darell Darby
>
>
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