[R-390] Tube shields

[odyslim at comcast.net]

 I have a radio that is loaded with them. It is a Collins R390-A
from the first run, #43.

 Scott

-------------- Original message -------------- 

> Hey Folks, 
> 
> Found something interesting this evening while working on an R-390 
> restoration. Found two ELCO tube shields...the silver twist lock kind with 
> the IERC finger style contacts between the shell and the spring. I thought 
> at first some wise guy had shoved it up in there to make a somewhat hybrid 
> IERC tube shield. Upon closer investigation it appears to be factory. 
> There are two folded indentations in the shell that catch the bottom of the 
> finger contact piece to keep it from sliding out when the shield is pulled 
> off the tube. 
> 
> Interesting.... 
> 
> Is this a new find or are these shields pretty common? First I have seen! 
> Not sure they are any better than the silver variety as far as dissipation. 
> 
> Cecil.... 
> 
> 
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