On Tue, 3 Oct 2017, Paul Andrews wrote:
Make sure your wall wart is pumping out a steady voltage close to that required
- you would need an oscilloscope. I have heard that this can be a problem for
these clocks.
I???m also not a big fan of running tubes near the bottom range of their
current specs. It seems to lead to more cathode poisoning. There are various
threads where this has been discussed in great detail - with evidence.
Apologies if this all sounds like hearsay, but it is based on the conclusions
of similar threads.
Is the way the tubes are being driven possibly a factor?
I have a tubehobby kit and my IN-18 have been constantly running for
almost a decade and the digits still look basically brand new.
It multiplexes them at a relatively low frequency so there's an audible
whine from the tubes, the only downside to the kit.
-Dan
