Don't mess with the alignment yet! If you don't have a well
calibrated signal generator (a frequency counter to go with it would
be better) you will probably just screw up the IF alignment. It is
important to get the third if aligned to exactly 60 kHz for the
sideband selector function to work properly. You will need a sweep
generator to properly align the first (3035 kHz) IF. The IF alignment
is unlikely to be the problem with the oscillation. Only attempt the
IF alignment if you have the proper equipment and know how to use it.
If the alignment hasn't been messed with, it is probably OK.

Make sure all tube shields are in place and all the bypass capacitors
are good. The HQ-180 uses mostly ceramic caps, but as mentioned, they
can be bad. Replace the filter caps first, then go from there. --Ed