[Hallicrafters] Polishing Tube Shields

[WA1KBQ at aol.com]

Sodium Bisulfate in water

-Greg

In  a message dated 10/19/2009 8:36:51 P.M. Atlantic Standard Time,  
bonddaleena at aol.com writes:
Hi, for what it's worth, the black inside and out  is the best. Look at 
the very late Collins 75A-4s. They have the shields  (IERC?) with the 
inner contact material.
Having said that, I polish all  my tube shields with a bench grinder 
mounted buffing wheel. I use 'white'  compound which leaves them looking 
like chrome. However, I always:
1.  paint the interior of the shields with flat black.
2. run EVERY tube radio  with a silent muffin fan somewhere in it. My 
R390A has two....

I  learned this a looong time ago when I laid my bare arm on my beloved 
Drake  TR-6, which had been on all day (19 tubes in that little box).....
Since my  A-4 is one of the first, I love the look of the polished 
shields. With the  combo of the black (inside) shields, and the fan, the 
A-4 can run 24/7 and  it barely gets above room temperature. Cool, eh??? 
Get it?  ha  ha

have fun!!

ron
N4UE


-----Original  Message-----
From: David C. Hallam <dhallam at rapidsys.com>
To:  w9xf at comcast.net
Cc: List Hallicrafters  <hallicrafters at mailman.qth.net>
Sent: Mon, Oct 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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