[R-390] Re: IERC tube shields and tube temps...a field expedient...

[Darryl Jones]

Well, I'm gonna give it a try and find out. Whats the worst that
can happen? I lose a couple of tubes, of which with one or two
exceptions, I have bucketloads :)

Does anyone have a suggestion of how I can measure tube temps
accurately?

Darryl
----- Original Message -----
From: "Kenneth G. Gordon" <keng@moscow.com>
To: <R-390@mailman.qth.net>
Sent: Monday, April 21, 2003 1:28 PM
Subject: [R-390] Re: IERC tube shields and tube temps...a field expedient...


> I have had pretty good luck with simply spray painting the
> inside and outside of a shiny tube shield with flat black paint
> after masking off the lower part which would make electrical
> contact with the grounding ring on the socket. My idea was that
> the shiny interior of the tube shield was reflecting some of the
> heat back into the tube, and by painting it black, some of that
> reflected heat was absorbed instead by the shield and
> transferred to the outside.
>
> Temperatures were noticeably lower for tubes with which I
> tried this, although I didn't actually measure them.
>
> I have not yet tried to cut ventilation slots in them.
>
> I suppose I should try some sort of heatsink material around the
> outside where it might fit.
>
> Ken W7EKB
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