[R-390] A bit more on my IF deck

[Barry]

I got the resistors replaced and all seems fine.  I need to do a full IF
alignment, but it seems to be behaving just a slight bit better.  I'm not
sure, but I think it doesn't take quite as long for the system to dump the
charge from SLOW AGC as it did.  Is that perhaps a function of that 2.7M
resistor?

I wanted to check the resistances and voltages around where I had worked.
Everything looks pretty good except for pin 2 of V506.  According to the
manual, I should have about -0.4V, but I'm getting nothing (HP410B used
here).  Checking the resistance, the manual states I should be seeing 500K
in AGC mode and I'm only seeing 400K here.  There are three resistors to GND
from V506, pin 2 and they add up to 500K.  Apparently I have something else
parallel to this that's pulling the resistance down a bit.  It's always
something.  Any guesses why I don't see -0.4V here?

Thanks,

Barry - N4BUQ