[Hammarlund] purpose of tube shields

[Mike Pagel, K9UW]

There is an interesting explanation of the purpose of tube shields at:
http://www.qsl.net/kh6grt/page4/shields/shields.htm

I remember reading a magazine article, decades ago, about making shiny tube 
shields darker by boiling them in salt water.  If I can't find it online, 
does that mean my memory is faulty?

73, de Mike, K9UW
Amherst, WI

-----Original Message----- 
From: Robert Sauvan
Sent: Thursday, September 25, 2014 1:06 PM
To: Hammarlund Mail List
Subject: [Hammarlund] purpose of tube shields

Hi all,
Can someone please explain to me what exactly is the purpose of tube
shields? Are they for rf shielding? It seems to me that a major
complaint about old tube radios is that they run so hot. As I have been
working on my various radios, lately of course my HQ-180, I have spent a
lot of time trying to swap tubes to find the "best" one for the radio.
Or, even one that works. Of course, you let it warm up for a while to
see if it works any better than the last tube you had in there, but, man
they are hot! When I leave a shield off for testing purposes, the tube
cools off really fast. Seems to me if the tube ran cooler, it might last
longer. Im just plain curious!

Thanks-Bob-W0YBS
______________________________________________________________
Hammarlund mailing list
Home: http://mailman.qth.net/mailman/listinfo/hammarlund
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Hammarlund at mailman.qth.net

List Administrator: Duane Fischer, W8DBF
** For Assistance: dfischer at usol.com **


This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html