I was lucky enough to find an HP 5061B cesium standard with what I think is a virtually new high performance (option 004) tube. These are rare because the high performance tubes burn up their cesium supply much more quickly than the normal ones. But you get much improved stability
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I set my HP 5065A Rubidium standard to the 5071A. Unlike a Cesium clock, the Rubidium system does have some drift so it needs to be tweaked occasionally. I plan to come back to this post every few months to update and see if we can determine the aging rate.
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I compared my old HP 5061A cesium standard against a much newer HP 5071A with high performance tube. Cesium standards are tweaked by adjust an electromagnet in the tube; this adjustment is called the “C Field.” In the 5061A you need to set the C Field manually, but the 5071A
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This is the first of several boring posts where I’m documenting the offset of a couple of my frequency standards so that I can come back later and determine aging rate.

This is my Oscilloquartz 8607-008 BVA quartz oscillator. I don’t know the last time it was adjusted, but when
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