[AMRadio] Bad tubes?

Geoff/W5OMR ars.w5omr at gmail.com
Tue Jan 9 22:38:48 EST 2007

Mike Sawyer wrote:
> I thought that tubes like the 250TH/TL were  collected for their 'platinum 
> plates?' Seems to me you could make some money with the scrap from the 
> metal.

Don't think those plates are platinum...

the filament is made of thoriated tungsten.

The spec sheet doesn't say what material the plate is made of.

75TH/TL, 100TH/TL, 152TH, 250TH/TL, 304TH/TL, 450TH/L, 750TH, 1000TH  
Mighty impressive line of triodes Eitel McCullough came out with.


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