[Hallicrafters] Polishing Tube Shields

[Carl]

The best shield is none if it works without it.

Other than that, the real IERC shield reduces heat and all others are heat
retainers no matter what the color.

There was a detailed study published on the subject, maybe in ER or on a
Collins forum as it related to a R-390 I believe.

Perhaps the best heat reducer is a bucking xfmr in the AC line to bring the
input down to 110-113V. A small 12V @ 2A xfmr is good for ~240W so its
loafing in any boatanchor receiver.

Carl
KM1H


----- Original Message ----- 
From: "David C. Hallam" <dhallam at rapidsys.com>
To: <w9xf at comcast.net>
Cc: "List Hallicrafters" <hallicrafters at mailman.qth.net>
Sent: Monday, October 19, 2009 7:13 PM
Subject: Re: [Hallicrafters] Polishing Tube Shields


> Let me throw out an idea here and see how many people can shoot it down.
>  Polishing tube shields might not be the best idea for heat transfer
> and tube cooling.  What about using something like gun bluing to obtain
> a deep blue or black color which would improve radiation.
>
> Standing by for the flames.
>
> David
> KW4DH
>
> w9xf at comcast.net wrote:
>> Wondering what people are using to polish tube shields. I have Wenol, but 
>> might there be something better? I'll be using it on my SX-101 MK III & 
>> HT-32A.
>>
>> Thanks & 73,
>>
>> Steve
>> W9XF
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