|[AMRadio] 813 question|
w1eof at hamnutz.com
Tue Jan 31 19:45:56 EST 2006
I asked on the Tube Collector Assc list and got this response from Lane
who is a retired engineer from Eimac and one of the knowledgeable people
regarding the manufacturing of transmitting tubes:
"The leakage/breakage of metal to glass seals is primarily due to thermal or
mechanical stress. There should be no reason for tubes just lying around to
have any seal problems."
> -----Original Message-----
> From: charles free [mailto:mjcal77 at yahoo.com]
> Sent: Tuesday, January 31, 2006 10:13 AM
> To: amradio at mailman.qth.net
> Subject: [AMRadio] 813 question
> Hello all,
> I have a buddy who insists that if I don't get my old
> 813's out of the "future project" box and fire the
> filaments up on them now and then, the base seals will
> eventually deteriorate. I guess he is talking about
> the adhesive that secures the base to the bulb. I
> don't see how the glass envelope where the leads pass
> through the glass could be affected by lack of use,
> but maybe one of you folks has experience with this.
> Anybody heard of this one before?
> W4MEC, Charlie in NC
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