[R-390] Need tubes and help on a R-392

[jmiller1706 at cfl.rr.com]

If this is the same PTO as the 390a, there is an endpoint adjustment coil on the front of the PTO to correct the endpoints (a screwdriver adjustment).  More than likely the PTO components have drifted with age such that this coil adjustment will not compensate enough.  In the 390 archives there should be a procedure for removing and opening the PTO, then removing a turn off of the endpoint adjustment coil to bring the endpoints back in again.
Jim N4BE

---- DJED1 at aol.com wrote: 
> If the set is working pretty well the cams are probably OK (and they affect  
> everything but the frequency readout).  Now I'm extrapolating from my  R-390A, 
> but the frequency offset is probably caused by a misalignment  between the 
> frequency readout and the PTO.  The first step is to see if the  zero adjust 
> will allow correction of the 10 Kc.  On my radio, you set the  dial at the 
> correct 100 Kc point, turn in the zero adjust, then turn the dial to  zero beat with 
> the calibrator.  If that will correct the offset, you're all  set.  If the 
> zero adjust doesn't have enough range, then you may have to  loosen the coupling 
> between the geartrain and the PTO, then manually set the PTO  on the correct 
> frequency and retighten the clamps.  If the overrun at  each end of the dial 
> is about the same, that indicates to me that the PTO is off  a bit. Can't help 
> you with details since I haven't worked on a R-392.
> Ed
> 
> 
> 
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