[R-390] Some progress

[polaraligned]

> attractive for wiring in the first place.  Too bad it forms a coherent
> non-conducting oxide so easily - bad for junction contact 

> Dan.
> 

I am suprised they did not use thin stainless for a "no holds barred"
receiver.  I'll bet the aluminum has caused a lot of strange problems
in the past such as ground loops, etc because of the formation of
aluminum oxide.  That is why I treated all my grounds.
The best built radio I ever worked on was a Atwater Kent 55c which was
built in 1929.  It had a stainless chassis and was made like 
a work of art.  The chassis cleaned up to almost a chrome plate look.
Too bad the radio is not a performer....It is just a TRF unit in the days
before commercial heterodyne radios.

Scott