[R-390] Alternative to IERC tube shields?

[Robert Nickels]

Shoppa, Tim wrote:
> Perhaps if IERC's are not a available, a better alternative for the
> vast majority of tubes that don't actually need shielding, is no shield
>   
Agree, Tim.  And while I haven't done any testing to prove it, I would 
think that adding a bit of forced convection cooling would help a lot.  
Thanks to cheap and quiet brushless muffin-type fans it is easy to try 
at least.

73, Bob W9RAN