[Amps] cooling chimney?

[Carl]

Quite off the wall as well as tried by others over the decades with often 
disastrous results,

Tube chimneys need not only high temperature glass but it must be able to 
withstand RF radiation as well.

Since the tubes you mentioned do not require forced air cooling the benefit 
of a chimney is a hair above zero. OTOH a little cooling air from a muffin 
fan is beneficial if the tube is running near its max and/or the convection 
cooling is restricted by enclosure shielding. I cool my 250TH's and 304TL's 
that way.

Carl
KM1H


----- Original Message ----- 
From: "Stirling Schmidt" <kc0nxm at sbcglobal.net>
To: "AMPS submit" <amps at contesting.com>
Sent: Sunday, July 13, 2008 9:18 PM
Subject: [Amps] cooling chimney?


Hi all:
Here are 2 off-the-wall ideas: Can clock-type glass domes (with hole cut in 
top) be safely used for chimneys to fit antique globe shaped tubes like 
RK65/5D23, 304TL, 250TH? Also, what if cooling air is introduced inside a 
chimney via a 90-degree elbow or 2, so as to cause a 'swirl', and increase 
cooling efficiency? Any thoughts appreciated...
Stirling Schmidt KC0NXM
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