Do they both run fast? Designs that simply count the mains are susceptible to noise pulses adding to the total, and most early designs were prone to this defect. If this is the case, I would try filtering out the noise spikes: ferrites on the primary side, and a low-pass on the rectified line frequency reference. (One exception was the CT-700x which could be made to run little slow or fast, depending on the setting of the MUX rate.)
On Sunday, November 17, 2019 at 3:53:02 PM UTC-8, philthepill wrote: > > I bought two different models of Heath Kit clocks with flat planar neon > displays. They were both plugged into two outlets on the same AC > extension cord and then the extension cord was plugged into a wall > receptacle. One runs as 24 hour clock, other one is a 12 hour clock > After a few days they are not at the same time and the longer they run the > further apart they get. I thought that they both used AC line frequency > for timekeeping. Any ideas, I'm stumped by this. > > Thanks Phil B. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/4381ac08-ade7-48d9-8c1a-6f530d7b3ff8%40googlegroups.com.
