[R-390] More CV-591

[Jim Brannigan]

I started working on my CV-591 last winter.  It required so many replacement
resistors and capacitors in the RF circuits that I depleted the junk box.
When the box of new parts arrived from Mouser there was no time to work on
the unit.
I just got it back on the bench.
The first variable oscillator was making me crazy.  It was veery touchy to
adjust and it drifted constantly.  I finished replacing all the capacitors
in the circuit and it was still drifting.  The resistors checked out OK, so
I tried some chill spray.  The last culprit was the cathode/feedback
resistor.  On to the mixers!!

I don't advocate wholesale replacement of parts, but if I was just starting
this project I would remove the all vertically mounted "circuit" boards and
replace all the components.

Jim