[R-390] aligning an R-391 IF deck

[Paul H. Anderson]

Hi folks,

I'm doing an R-391 alignment (390 non A), and hit a snag early on.

When tuning the coil on Z-501, there is no change in the diode load
voltage.  I _think_ my earlier steps are good enough, but I'm not sure.

I notice that with my URM-25D, the output frequency drifts fast enough
that it is fairly difficult to find peak frequencies - even just turning
the frequency generator knob carefully enough while peaking on the .1KC
bandwidth setting is challenging.

Is getting the coil (not the cap) on Z-501 sensitive to correct IF
alignment prior to that point?  Everything else was peaking pretty easily
(though touchy due to URM-25 drift).

Is dumping the URM-25 and getting a better siggen a reasonable idea?  Will
redoing caps and resistors stabilize it to any significant degree?  The
drift is about 10-20 cycles/minute (downwards), which is a pain when
trying to align circuits trying to filter 100 cycles.

Thanks for any advice,

Paul