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Waltham Electrodyne Swissonic

Hello. I recently purchased a Waltham Electrodyne Swissonic. It's a
vintage balance wheel quartz. I was wondering if anyone has any info on this one.
Thanks,
Matt
Answer:
...on what may be a similar Timex movement in this thread on the Watchmaking & Repair Forum. I don't know anything about these movements. They sound like another dead-end technology, which makes them interesting. Do you have a pic of the watch/movement?
Timex quartz/balance wheel...
Paul.
Answer:
that this works similarly to things like the Hamilton, Landeron, LIP, Junghans, etc electrics in all but one characteristic.
In these electromechanicals the timing of when to energize the coil(s) that push(es) the balance wheel is controlled by the balance wheel itself. In all of these movements there is a contact system that is closed when the balance swings past a certain point. So, the timing of the pulses is controlled by the balance's moment of inertia and the hairspring's spring constant.
I would guess that this Waltham and the previously mentioned Timex use a balance and hairspring that normally would give pretty good timing, but that the rate is fine-tuned by energizing the coil based on the quartz generated time pulse. This would be sort of similar to the Accuquartz, where the tuning fork provides a low Q rate and the specific frequency of osciallation is quartz controlled.
On the one hand, I would think these watches would be easy to get into a non-running state - if the balance's natural frequency was far off the crystal's enforced one (because of dry oil, hairspring damage or magenetism, etc), I would think they would "fight"; effectively stopping the watch or killing the cell pretty quickly. On the other hand, this type of a setup SHOULD provide more accurate timekeeping than a traditional balance-controlled watch, and the elimination of make/break contacts should make the whole system much more reliable.
Of course, all of this is conjecture. I'd like to hear from someone with more experience with these kinds of watches.