[AMRadio] Need advice on storing RF power tubes

[Geoff Edmonson]

> >  But every once in a while I hear that storing power tubes in a cold
> > climate somehow degrades them or renders them useless.
>
> I remember seeing a warning somewhere a number of years ago about storing
> certain power tubes at subzero temperatures.   As I remember, the 100TH and
> 250TH were mentioned specifically. Seems the tungsten filaments can
> contract and fracture.   Seems possible, but I have never experienced this
> personally and pass along the information for whatever it's worth.

I was never warned about storing tubes in the cold (In South Texas, we got to 
27 this morning, for about and hour or so, the back to 64 for a high) but I 
WAS warned by Mr. AM (rip) John L. Mohn/W5MEU - Store them tubes vertically!

The filament can sag and fall into the grid, causing a short.  At least on the 
bigger jugs - 811's, 813's, 100TH's, 250TH/L's, etc...

Happy New Year y'all

73 = Best Regards,
-Geoff/W5OMR

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