[R-390] R-390A IF Module Layout

[Tim Shoppa]

> BBODs are bad news "bears"!  *IF* one or more "somehow" passes the 
> tests, exhibiting MIRACULOUS behavior, it will bite you *IF* you use the 
> radio.

> If it doesn't take out a filter,, it may take out an IF can or some 
> other hard to impossible to find component.

OK, that's the rhetoric, the reality is:

1. The vast majority of BBOD's in a 390A are used in filmanent bypass
or cathode bypass where massive leakage, a thousand
times or a million times bigger than the spec, will make NO DIFFERENCE
AT ALL because the cap is used at some puny low voltage and even if
it was leaking it couldn't do anything bad anyway because there's no
way it's going to have an impedance lower than the DC resistances of
the circuits involved.

2. C553 was never a BBOD in any IF deck I ever saw. It was always
a high-quality metal-can cap.

All this evil gets assigned to BBOD's, and there's no shortage of BBOD's,
I understand that folks like recapping (done it myself, I think that anyone
is justified to replace the half-century-old Vitamin Q at C553 with a
modern high-quality cap), but the BBOD's are getting blamed for evils that
they cannot possibly be causing.

Tim N3QE