[R-390] R-390 Cooling Fan

[Roy Morgan]

At 12:10 PM 7/21/2005, Craig C. Heaton wrote:
>Good Morning to All:
>
>And my $0.02 worth.................I have several hundred cryogenically
>treated orange drop (715 style) capacitors with years worth of refrigeration
>stored in them

Craig,

Have you seen the websites that actually offer cryogenically treated audio 
tubes?

No s**t.

Only a hundred dollars or so each. 12AX7's, 6L6's and even a pair of 
KT-88's if I remember right.  Astounding prices.

<http://www.physicsforums.com/archive/t-59273_Cryogenically_Treated_Vacuum_Tubes.html>
is a discussion

<http://vacuumtubeaudio.com/cat8_1.htm>
has tubes for sale

<http://www.metal-wear.com/electronics_$_stereos.htm>
is an explanation from a company that does such treatments on parts. They 
mention reports about missile parts, electronic circuit boards, and other 
things that were improved by such treatments.

 From my Google search, it appears that some folks who own and/or 
manufacture and sell firearms believe that cryogenic treatment of gun 
barrels and shotgun chokes improves them.  This I can understand.  Vacuum 
tubes?  No, I don't understand.

Roy

Whose freezer is * not* big enough for the GPT-750 transmitter, but might 
hold a McIntosh amplifier or two.


- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Cell 301-928-7794
Work: Voice: 301-975-3254,  Fax: 301-948-6213
roy.morgan at nist.gov --