Picked up a nice looking Drake RV-75 vfo for my TR-7 last weekend. Hooked it up last night and my main vfo was in the middle of the 20m band, but when I switched on the remote vfo freq drop to around 13.9mhz and I am not able to adjust it. I guess I got a hamfest special. Any hints on what to look for? I have not even opened it up. Got a great deal on it however so I hope I can fix it. I showed it to Evan, K9SQG when I ran into him there.?