Hi. I'm working on my 1967 Brittain TC100 turn coordinator wing leveller. It works on vacuum but not electric and I've narrowed the problem to the LC filter in the remote power supply. Does anyone have the manual that might spec out this component? It's about the size of an AA battery. The gyro spins up when I bypass this filter so... But I'm thinking it suppresses the high frequency noise created by the power supply.