Other than brightness, some have observed mechanical 'singing' coming off the larger tubes, like IN-18s. If the multiplexing frequency is too close to the mechanical resonating frequency, of the tubes, you may hear the tube buzzing. That usually can be remedied by altering the frequency. And only a small amount. Change it too much, and you'll jump on top of a harmonic (multiple) of the resonant frequency, which is almost as bad. Plus you'll have to find those numbers, experimentally.
Oh, and if you pick too low of a multiplexing frequency, you'll see them flicker. But then again, can easily be remedied by increasing the frequency. Of course, if the frequency is too high, the tubes won't have enough time to turn-ON. But there's a wide range between flicker (low) and turn-ON (hi) issues. All the clocks, I've made, are multiplexed. No problems, and some of them are approaching 10 years of operation. Only problem, I've had, was choosing the IN-4, on my first clock. Those are not mercury enhanced, hence need to be replaced periodically. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/ga-uSudc4K4J. For more options, visit https://groups.google.com/groups/opt_out.
