Batboard

Hello, all. Looking for some info. I have 3 Minitor II's here on the bench, all on 154.xxx, and wonder how easily they'll convert to 146.xxx for Ham use. Is there a formula to figure the LO crystal frequency?

Also looking for info on an old Zetron Model 10 tone encoder. I've found the hookup for 12v and TX Audio, but any ideas on how to set/send tones?

Thanks!