I have a need to add FM to this Transmitter. I have a 6n2 VFO and the
manual say a FM can be added. But I need a FM VFO.

My recollection is that the 6n2 VFO was modified to add NBFM capability. A
varicap was used to modulate the oscillator directly. Seems like there was an
article in QST or one of the other magazines in the early 60's.

Doug Moore KB9TMY (Formerly K6HWY)