[R-390] IERC tube shields for my R-392

[Charles P. Steinmetz]

Frank wrote:

>As far as I can tell, the 5015 is 1.5", which covers the majority of 
>the 7 pin "short" tubes in the R-392, and the 6020B covers the 
>medium 9 pin @ 2.5".

The 6020 is the medium 9-pin shield, but it is 2" tall.  The last two 
numbers are simply a pair of digits representing tenths of inches -- 
"15," "20," and "25" for the short, medium, and tall heights of 1.5, 
2.0, and 2.5 inches.

One question -- does the 392 have the tall shield bases necessary for 
the IERC shields (about 1/2" tall)?  (The IERC shields work by 
conduction, sinking the tube heat to the chassis via the tall shield 
bases.  Putting IERC shields on tubes that lack the tall bases will 
make things worse, not better.)

Best regards,

Charles