[Hallicrafters] Polishing Tube Shields

[howard holden]

The coating itself also aids in heat transfer because it provides more actual surface to surface contact by filling in micro gaps in the metal finish, not unlike heatsink grease. 

Howie WB2AWQ
  ----- Original Message ----- 
  From: Glen Zook<mailto:gzook at yahoo.com> 
  To: w9xf at comcast.net<mailto:w9xf at comcast.net> ; dhallam at rapidsys.com<mailto:dhallam at rapidsys.com> 
  Cc: List Hallicrafters<mailto:hallicrafters at mailman.qth.net> 
  Sent: Monday, October 19, 2009 7:42 PM
  Subject: Re: [Hallicrafters] Polishing Tube Shields


  I have to agree with this.  For best heat transfer the tube shield really needs to be dark on both the inside and outside.  When the shield is "shiny" there is a tendency for the heat to be reflected back into the tube rather than being dissipated.

  Glen, K9STH

  Website:  http://k9sth.com<http://k9sth.com/>


  --- On Mon, 10/19/09, David C. Hallam <dhallam at rapidsys.com<mailto:dhallam at rapidsys.com>> wrote:

  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.