[R-390] VFO endpoint adjustment - stumped!

[DJED1 at aol.com]

Sounds like you have a Cosmos PTO with the linearization adjustment.   The 
end point adjustment is to the RIGHT of the linearity adjustment, hidden partly 
behind the transformer housing.   However, you're only going to move the PTO 
tuning range a few KHz with the endpoint adjustment.   If you're off 50 KHz you 
either have a problem with the mechanical stops or with the PTO capacitors.   
Is the mechanical stop you're hitting within the PTO itself or the 10-turn 
stops in the radio?   You can change the realtionship of the PTO and 10-turn 
stop simply by loosening the shaft clamp on the PTO and turning it without 
adjusting the radio's geartrain.
Ed