Success!!! I really appreciate all of the help from Tristan and others. Nice to have my clock back.
Turns out the trace from blanking from pin 9 of the 74HC74 takes a very long route around the edge of the board in reaching pin 2 of U17 (6N137). There was a small defect in the copper trace that must have failed over time. I was checking the blanking signal at the 74HC74 and missed checking the final connection to the 6N137. The point about resistor voltage ratings is a good one, I often work with tube gear where this is an issue. The CRT is a 3RP1A btw. They've become pricey but fortunately seem to have a long lifespan. On Saturday, October 30, 2021 at 9:31:12 AM UTC-4 jrehwin wrote: > Most DMMs have 10Meg input impedance, so you can put a 10meg resistor > in-series with your meter, and measure double the voltage. > > > Note that many resistors are rated at only 150V, and aren't suitable for > high voltage service like this. There are, of course, resistors with > sufficient voltage specifications, but they're less likely to be found in > your junk box. > > - John > > -- 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/c8a99ecd-860b-4bdc-a06e-237c6d3db4cen%40googlegroups.com.
