[Boatanchors] Tube shields CORRECTION

[Glen Zook via Boatanchors]

There are a number of people who have tried painting the "shiny" shields with flat black paint, both inside and outside, that have found a reduced tube temperature.  Over the years, I have tried this a few times and the temperature of the tubes did seem to be lower.  However, I never actually measured the temperature and, as such, the reduction in temperature is more anecdotal than scientific.
 
Glen, K9STH


Website:  http://k9sth.com


On Sunday, May 25, 2014 6:52 PM, Bob Young <bobyoung53 at hotmail.com> wrote:
 



And tubes with no shields run somewhere between shiny and IERC shields. Tubes that are not shielded run cooler than ones with the shiny shields and ones with IERC shields run cooler than both, as Bob says down below they conduct heat away from the tube. I usually take off shiny shields from tubes that don't need them for rf purposes if I don't have IERC shields.

Bob
KB1OKL

> Date: Sun, 25 May 2014 19:19:48 -0400
> From: rbethman at comcast.net
> To: boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] Tube shields CORRECTION
> 
> One reason for *some* shields, such as the *IERC* types, is that the are 
> lined with a pleated liner that conducts heat to the same type metal 
> outer piece.
> 
> The whole intention is to wick heat away from the tube at a faster rate 
> than simple convection.
> 
> These also have a base that is also designed to work as a complete unit.
> 
> The tubes with these run significantly cooler that the shiny nickel or 
> chrome plated ones.
> 
> Bob - N0DGN
> 
> On 5/25/2014 6:48 PM, Bob Jackson wrote:
> > I always assumed that tube shields were used to keep stray RF either in or out of the tube or both. Are there other reasons as well like keeping them securely in their sockets via the little springs inside the shield?
> >
> > Bob
> 
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