[R-390] kilocycle/megacycle movement

[Joe Foley]

Sounds like the MHz detent spring has a groove worn
into it, it should be a positive lock-up.  Nolan would
suggest putting some washers under the spring to bring
a newer area into contact with the notched disk.

Typical problem having the KC knob turn the MC knob,
the MC detent should hold the MC in place, sounds like
time to lube!  Check for burrs on the split gears.

Let us know what you find,

Joe



--- Dan Merz <djmerz@3-cities.com> wrote:
> Hi,  I haven't used my  390a much over the last 2 or
> 3 months and I was
> listening on 80 meters tonight and found a problem
> tuning up near 4
> Mhz.  It seemed dead there and I could tune in
> stations down near 3.9
> somewhat better (I started listening on another set
> for comparison to be
> sure the band wasn't dead).  After awhile I noticed
> that the megacycle
> knob seemed to move off its "lock" position and was
> moving as I tuned
> the kilocycle knob.  It did this sometimes and would
> get off the band
> position but not always.  Is this most likely a
> lubrication problem?  I
> really never was able to pick up a known signal at
> around 3.99 Mhz and
> I  tried rocking the megacycle knob to improve
> things,  or to find if
> something else was "hanging up".  I haven't lubed
> the set since about 2
> years ago when I did a pretty thorough job in this
> regard and everything
> seemed very free.  I'll pull it open tomorrow and
> take a look but was
> curious if there was an obvious known component that
> causes this kind of
> symptom. It seemed ok on other bands but I didn't
> spend a lot of time
> checking.   thanks,  Dan.
> 
> 
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