[R-390] IERC 6020-B cans

[Todd, KA1KAQ]

On Mon, Oct 29, 2012 at 12:35 PM, Peter Cade <petercade at verizon.net> wrote:

> I've been putting together a set of Tube Shields for an R390A and have
> manged to find them all but the6920-B's.
>
> since these are the med 9pin shields I must assume they're the most
> popular,
> and hence hardest to find.
>

Also used in a lot of other gear. Some years back, I'd guess a decade or
more now, several of us on this list put together the Great IERC Tube
Shield Swap which allowed folks to swap sizes they didn't have for what
they needed. A few members even sold them outright, but most of us guard
them jealously and only trade for other sizes we need. In my case, I'm
always looking for the tall 7 & 9 pin versions, the 5025 and 6025.

If you've got others to trade, I'd suggest going that route. List what you
have and go from there. In a pinch, the later, open-top 6015 types will
help. This is the style where you can actually look down the sides of the
heat sink that contacts the tube envelope. The older types with the rolled
lip/edge around the top will not as they trap heat inside.

There is still a lot of gear going to scrap daily with these shields inside
from scopes to avionics. When all else fails, dig around and do a little
dumpster diving.

Then again - if memory serves me correctly, there was a bulletin telling
techs to discard all but certain shields and run the receivers without them
- for what it's worth.

de Todd/'Boomer'  KA1KAQ/4