[time-nuts] Query about 5061B performance and tuning

[AC0XU (Jim)]

Time Nuts-

I have attached some MADEV estimates for several cesium beam oscillators in my home lab (I have previously posted references to my researh papers about ensemble ADEV measurements).

Two of these oscillators, labelled 5061B1 and 5061B6 perform worse than the others. 5061B6, in particular, seems to have very poor lock.

1. 5061B1 had a failed tube in which I subbed a very old but working tube. Prior to the failure and substitution, it performance was as shown as "5061B".  All standard tests from the service manual are successful. The Beam I is rather low (15) and cannot be increased.

2.  5061B6 is unit which, according to all the standard readings, should be performing well. Beam I easily set to 25. Etc. However, it isn't.

Any suggestions about what I should be looking to test/tweak on these two units?

Thanks!

Jim
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