My name is Don Young. My main interest is in magnetometers. My latest project is trying to restore an old Varian Model 49-538A Rubidium  Oscillator / Magnetometer. These were produced by Varian in 63 or 64. I’ve been searching for day trying to find schematics or another oneto change out boards etc. to find out why mine does not work.Any help or suggestions are greatly appreciated.