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

[DJED1 at aol.com]

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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