R-388 Problem (resolved)

[W7SOE]

I have finally had time to dig into my R-388.  I bought it some time ago, i hope it will be my first functional receiver in my elusive AM station.

I have completed the alignment, which went ok.  There were some minor issues but they were resolved.

Now the problem:
I can tune around on the 4mc band and get the receiver to go dead (no hiss) at discrete points.  It will sometimes also squeal at these points.  The S meter will have a large deflection.  Banging on the chassis will either fix the problem or cause the problem to shift in frequency.  The same will occur if I put a tool into the IF cans and prod the slugs, not turn them, just flex them ever so slightly.  It seems any perturbation will alter the result.
I am not sure this is the only band it occurs on, so far it is....  I have been able to enjoy the QSOs on 3870 here in the NW, just have to whack the chassis a bit.  ;-)  I hope to join in one of these days.........

Perhaps this rings a bell with someone?

73

Rich
W7SOE

[Rick K5IAR]

Next time it happens gently rock the BFO switch to see if it is possibly the culprit.

Rick/K5IAR

[W7SOE]

I'll give it a try, do you think it is the switch itself?

Rich

[W7SOE]

Tightening all the screws erased the issue.  Love an easy fix....

Rich

[Rick K5IAR]

Congratulations, Rich.  Bask in the glory of it, they don't come along often!

Rick/K5IAR