I like the use of chimneys with similar tubes for another reason as well,
for protecting nearby components.
In the past I experienced in one HB amp two times the desoldering of
capacitor connections (doorknobs etc.)caused by the heat of the very close
tubes.
It did not happen again since I use chimneys. Too much heat is also not
healthy for B&W coil stock.
73
Peter
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Carl
Sent: Montag, 14. Juli 2008 03:54
To: Stirling Schmidt; AMPS submit
Subject: Re: [Amps] cooling chimney?
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@sbcglobal.net>
To: "AMPS submit" <amps@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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