The old clock was/is set at 173.1V. The new one was at 168.5V.
So before testing, I did the following:
· Set both clocks to 173.1V without any tube attached
· Set both clocks to the exact same settings (tube dimming starts
at 3:00am, so no tube dimming during tests)
· Set both clocks to setup mode so we have the same digits lit “01
01 99”
At each clock, I measured the following:
Older Newest
HV 173.1 173.1
R2 43.92 38.8
R3 39.1 37.1
R4 36.6 36.6
R5 35.2 37.2
R6 36.4 33.6
R7 35.6 36.9
My older clock seems to be a Rev5 clock, because on the documentation it
says 10k for R2-R7. However, Rev5 mentions R15 and both my clocks don’t
have R15. I don’t remember contacting Pete about R15, but it’s not there.
Don’t see it also on the schematics of Rev5 documentation.
The Rev6 documentation mentions R2-R7 with 8k2 and does not mention R15 at
all.
Conclusions so far:
- The newest clock was set for 168.5V. This by itself should not be a
problem, I suppose, but I increased it to 173.1V
- While testing both clocks, I used different power supplies than their
regular ones. One of them clearly had a problem: on the new clock, under
load I got on HV 145V… Clearly a bad power supply. When replacing with
another, both clocks had 173.1V when on load.
- I’m going to replace the new clock with a better power supply
- The “poisoned” tubes I moved to the old clock seem to be healing
- I’ve also checked all my tubes have the giver at the base
I’m inclined to be believe that the switched power supply might not
behaving correctly. I’m replacing it on the new clock… Maybe that was the
problem...
I’ll assemble everything again and keep an eye on the clocks.
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