I'm playing with my first Cs standard. It's a Datum 4065A which appears
to have a dead STEL-1173 synthesizer. Before I put too much effort into
replacing that, I thought I'd check the tube and see if it has any life
left. I've attached a chart showing the response of the central peak.
My methodology was similar to TVB's as shown here:
http://www.leapsecond.com/pages/cspeak except that I measured the tube
output directly with a digital voltmeter. The system is reporting
wildly varying levels for the beam current so I didn't want to use any
of it's circuitry.
Does this look like a usable tube? Healthy or on it's last legs? What
response levels are typical for a Datum 7504A tube? I see that these
levels are somewhat lower than those shown on leapsecond for the 5061A
tube, but that could just be the specifics of the measurement.
Thanks,
Ed
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