Todd, KA1KAQ writes:
Rick, it's been a while for me, but the main issue I recall was
expansion/contraction, with the envelope heating or cooling at a rate
that the glue couldn't match, resulting in cracked tube or broken
seal. It's been a long time though, so I really don't recall the
particulars.
JB Weld is used on engines and other high temp applications as
mentioned, so it would probably be fine. I run 810s as modulators and
they do get hot, but I doubt it would be an issue.
Guys, although JB Weld is good stuff, I'd shy away from it for this
application. It's rigid stuff when cured, and if its thermal expansion
coefficient differs "enough" from glass, something is going to give, and it
will probably be the glass.
I'd use high-temperature silicone (like the black stuff they sell for
gaskets at the automotive stores), because it stays somewhat "squishy," and
so will circumvent the above problem. That's what I'm going to try on an
812A I have with a loose plate cap.
JB Weld MAY work out OK, but...
73,
-Larry/NE1S
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