On 2021-10-30 12:28 p.m., GEK wrote:
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.
Great achievement, everyone loves a happy ending. Are you going to post
a nice success screen pic?
--T
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
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