[Hallicrafters] Polishing Tube Shields

[WA1KBQ at aol.com]

Yes!! Run them on 110V and everything stays  cooler... including power 
transformers.

-Greg

In a message dated  10/19/2009 11:41:32 P.M. Atlantic Standard Time, 
km1h at jeremy.mv.com  writes:
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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