Bryan Mumford made a controller for the Eureka clock which ensured it kept quartz quality time. I have had one on my No.1 clock for about 15 years and it keeps almost perfect time. Having acquired a No. 6 clock a few months ago I replaced the flag & pin set, cleaned it up and gave the case a bit of TLC. It ran well and reasonably accurately (one or two minutes/day which I could probably have improved) on 1.5v.
I wanted a second controller and experimented with the controller which Frank Roesky (who posts as Praezis on here) offered for the Bulle clocks.
Unfortunately I could not get it to work with the Eureka, but Frank kindly worked on it for me and developed a modified set of code for his controller that drives the Eureka brilliantly. The clock needed setting up ( via the star wheel) to loose a bit on full voltage (maximum arc) and gain as the arc decreased.
My No 6 has now been running on his new model controller for two weeks. It is driven by a pair of 1.2v Ni-Mh C cells in series. It has almost 345 degrees of action and after two weeks is keeping as close to perfect time as makes no difference.
The next question is how long the C cells will last. The same cells in Bryan's controller (his uses three in series) run the No.1 clock for about four months.
I wanted a second controller and experimented with the controller which Frank Roesky (who posts as Praezis on here) offered for the Bulle clocks.
Unfortunately I could not get it to work with the Eureka, but Frank kindly worked on it for me and developed a modified set of code for his controller that drives the Eureka brilliantly. The clock needed setting up ( via the star wheel) to loose a bit on full voltage (maximum arc) and gain as the arc decreased.
My No 6 has now been running on his new model controller for two weeks. It is driven by a pair of 1.2v Ni-Mh C cells in series. It has almost 345 degrees of action and after two weeks is keeping as close to perfect time as makes no difference.
The next question is how long the C cells will last. The same cells in Bryan's controller (his uses three in series) run the No.1 clock for about four months.
Next step is to see if I can fit the controller into one of Carlton clocks Eureka batteries so that it all looks right.
If anyone with a Eureka wants Quartz accuracy, then I recommend Frank's controller.
If anyone with a Eureka wants Quartz accuracy, then I recommend Frank's controller.