HI Nick, I know you have mentioned that before, but I really don’t think anything else is wrong. As I said I have another one of these with 566M tubes and it has worked flawlessly for 8+ years. Those electronics are in a similar enclosure with less ventilation. And this is the second set of electronics i have tried in this enclosure thinking there might be something internally wrong with the PCB. (I had that problem with one of my Thomas clocks way back when) But, I believe others have had issues with these electronics. Another variable vs. your clocks might be that I have wired in a pair of NE-2 Colons in parallel vs. the stock config that uses just one per each side. I doubt that would be an issue, but it may account for a slightly greater current demand. I don't think these clocks like anything, but an open air set up. Also, the close proximity of the 5V VREG and the IRF640 is somewhat suspect from a heat dissipation perspective. Anyway…I used a higher voltage capacity electrolytic this time, maybe I’ll this'll give me another year or so :-). and I will try your idea of adding a heat sink to the VREG, since heat seems to be the culprit here. Thx Nick
On Saturday, April 6, 2019 at 6:06:36 PM UTC-7, Pramanicin wrote: > > Something else is awry there Michael. I have a friend with a TubeHobby > IN18 that i built for him that’s been running for well over 6 years now > with no issues. The only modification i ever made was putting an extra > heatsink on the regulator as what was there (board plane) didn’t seem > sufficient to me (just a hunch, I’m sure Jonas knew what he was doing..).... > > Hope you get it sorted! > > Sent from my iPhone > > On Apr 6, 2019, at 17:15, MichaelB <[email protected] <javascript:>> > wrote: > > This makes 4 times now this clock has failed over the past 10 years or so. > This is a stock clock with IN-18's. I have another set of these electronics > that has never failed, but then again, I had changed the tube board to > accommodate the Z566M tube. Different current demands? It has worked like a > charm for years now. The failure with the IN-8 clock this time was a leaky > C6. In the past the inductor has failed, but usually its one of the > electrolytics in the Pwr supply stage. It's become kind of a ritual where > every 2-3 years I have to pull the clock apart and play detective and > figure out what's wrong after its starts blowing fuses. Kind of fun now, > actually! > > -- > 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] <javascript:>. > To post to this group, send email to [email protected] > <javascript:>. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/07394dde-1d45-4e3f-a38a-75ca15d16c48%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/07394dde-1d45-4e3f-a38a-75ca15d16c48%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > > <Tube Hobby Pwr Supply Schem..jpeg> > > -- 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 post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/22340da1-4f58-4673-bb1d-a9bdebb8fd14%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
