Donald, I agree with John, remove the gearing gizmo from the 10811 assy. the adjust hole lines up any way so no need to drill a hole. you just need a long insulated tuning tool. Also agree that a quick indication of tube operation can be seen if the beam current rises when the mod is turned off.
The Cesium tube test, set seen in http://leapsecond.com/corby/HP-5071A-with-5061A-4.docx is essentially a stand alone low frequency coil test. If I can't get a decent LF coil beam current I scrap the tube as it's a waste of time to put in in a unit and try the RF tests. The test set uses a 555 based oscillator. For low frequency tests in an instrument I use a 651B or 204C. Set the amplitude and frequency for a peak on the beam current, make sure mod is off and that you are on the central peak. The figure of merit test in the manual will give an indication of how well the tube and instrument are working, but a definitive test is to perform an Allan deviation of the unit. Cheers, Corby _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
