[Boatanchors] 3-500Z chimneys

[David Knepper]

-------Original Message------- 
 
From: David Knepper 
Date: 10/18/2009 1:42:33 PM 
To: RAY FRIESS; Boatanchors Mail List 
Subject: Re: [Boatanchors] 3-500Z chimneys 
 
Caution: It may seem expedient to use Coleman light fixtures as a substitute
chimney for 3-500Z, for example, but the truth of the matter is that there
is little air flowing to the top of the tube or around the plate seal which
is critical. 
 
That is why the original chimney glass curves at the top so that air can
sweep across the plate seal. 
 
They are definitely cheaper though and more readily available. 
 
David Knepper, W3ST-W3CRA 
Publisher of the Collins Journal and 
Secretary to the 
Collins Radio Association 
www.collinsra.com