On Thu, 17 Jan 2008 04:27:06 -0800, spamhog wrote:

Dull, black, heat resistant paints
have been used to help cool engines for ages.

It would be cool (literally) if one could spray and heat-cure unshielded
tubes
and improve their heat-shedding

Is there any indication that such paints, or some vacuum-tube specific
types,
would help keeping tubes cool
by improving heat radiation?

I'd love some factual info, if it exists, or educated guesses, rather
than uninformed blind guesses, as I am awfully good at doing uninformed
blind guesses already! :-)

What I know is that the glass will pass a proportion of the IR energy
being generated by the outside surfaces of the plate. Depending on just
how great a percentage, you may get more heating of the glass from the
paint capturing the radiation from inside than you get cooling from the
paint re-radiating it to the outside.

What I don't know is what will actually be the case.

--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com

Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html