I purchased an R-390a a couple decades ago and replaced the suspect
capacitors, etc. I haven't used it a lot in the interim due to high
urban noise but it has a tuning issue that I never resolved.
Specifically, there appears to be mechanical slippage somewhere in the
Kilocycle tuning mechanism. I have made sure that all the cams are in
the correct position at 7+000 and that the PTO is also correctly
positioned. I have also checked to see that there is no excessive play
in the Oldham coupler. Everything appears to be tight.
If I turn the Kilocycle knob rapidly, it appears that the PTO gets out
of synchronization. I haven't been able to identify any broken or loose
clamps in the gear train. I can readjust things so that are again
aligned but the problem repeats itself. The gear train is clean and
lightly lubricated.
Has anyone encountered and resolved this issue.
Thanks.
F.W. Bray
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