[R-390] More "bad" resistor comments and questions (a bit long)

[Barry]

Gents,

I'm in the process of replacing those 27k screen resistors.  I clipped one
end of each one from the "Switched RF/IF B+ Line" side and measured the
resistor completely out of circuit.  I'm seeing about 49k now whereas I was
seeing about 39k before.  I was measuring from Pin 2 of the main IF chassis
plug to the #6 pin of V502 and V503 so I should have had nothing but those
27k resistors in the line I was measuring so I can't account for the
difference between the "then" and "now" readings.

Something else that's kind of strange.  There are 82k resistors from pin 6
to ground.  With the other resistors now clipped (isolating the #6 pins from
the rest of the IF module), I'm seeing about 76k for the values of these
resistors.  The only other component in this equation are the 5000pf disc
ceramic bypass caps also from pin 6 to ground.  Is it possible these bypass
caps are showing some DC resistance (i.e. very leaky) and that's causing me
to see some parallel resistance across those 82k resistors?  If so, then
this may account for why the 27k resistors have nearly doubled in value over
the years.  If those 5000pf bypass caps are that leaky, then they would
cause excessive current to be drawn through those 27k resistors constantly.
Does this sound reasonable?

The 5000pf caps in question are "Erie" brand and are rather dark brown in
color.  Does anyone else have any experience with these going bad on a
consistent basis?  I don't want to cut a leg on these caps just to test
them, but when I unsolder the old 27k resistors, I'll be able to unsolder
one leg of the 5000pf caps and test them completely out of the circuit.

Thanks!

Barry - N4BUQ