[R-390] Alternative to IERC tube shields?

[Shoppa, Tim]

> Considering the increased price for the IERC tube shields, can it be an
> alternative?
> Your thought?

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.

I agree that the IERC's are great if you've got them. I've picked some
Up over the years from hamfests etc. but that can be a painfully way slow
To get to the quantities needed for a 390A.

I am slowly learning sheet metal techniques and have worked my way
up to "make a chassis box". While I lack the skill, I think the thermal
and moral equivalent of an IERC tube could be reproduced by a
sufficiently enthusiastic hobbyist. As it is, though, it's usually
way more fun to mess around with radios and electronics than it is
to do sheet metal stuff (although it is highly satisfying when I actually
get the round tuit and do sheet metal stuff.)

IERC cans appear to be seamless, so they were probably deep drawn?
Is this likely the same process used to make the deep unseamed metal
Capacitor cans?

Tim N3QE