[time-nuts] Oscilloquartz 2200 Clock / B-5400 Oscillator

Adrian rfnuts at arcor.de
Tue Jan 20 17:32:53 EST 2015

I ran into a nice Oscilloquartz 2200 digital clock / precision crystal
oscillator from the early 80's that is in need of some care.

Please let me know if you have any manuals / data sheets / catalog pages
or other information to share.

At the moment I'm working on the faulty power supply. Any schematics,
also from a 2210 that appears to have the same PS would be very helpful.

The 2200 houses a B-5400 high performance oscillator that has been
reported here:

Any other information, data sheets etc. would be nice.

I tested the oscillator on an external power supply. After about a day
of continous operation it was obviously still running in, but first ADEV
mesurements pointed into the low E-13's.

Unfortunetely, it stopped then drawing current, so I had to take it
apart. Out came a nice dewar-packaged cylindrical oscillator housing.
When I pulled it out, the heater windings unwound like an untied spring.
That will be a challenge to get nicely rewound but should be possible.
Any advice what glue to use for fixing them permanently on the housing
are welcome.
The culprit was a hermetic tantalum cap in the 10V reference circuit.


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