I was fortunate to have picked up this gem from a recent estate sale:

Never had one before and haven't even seen more than a couple.   I'm curious - what external equipment might have been powered from the FT-310-A adapter?

I can rob one off another receiver, but are there any good DIY alternatives for a local tuning knob (unless someone has a spare MC-237 burning a hole in their drawer ;-))

73, Bob W9RAN