The brightness pot needing to be turned right up still suggests that you
have a problem with grid voltage control. I'd expect to see some higher
frequencies much higher than 60Hz on the BLNK- signal as well though. I'd
be surprised if the problem was in the supply sections for the cathode or
an
I dont have the same exact scope-clock, but with mine the intensity, focus,
and astigmatism adjustments all interplay with eachother. Mine uses an
8SJ31J tube, and there is a test-point where you can verify the HV is
correct. It should measure 300V.
On Monday, October 25, 2021 at 5:20:26 PM UT
Ok, so I'm stumped (again)...
I have replaced D35-38, C52, C53, C54, C55, Q1, C51 and U17.
R67, F68, R69, R70 and R71 measure correctly in circuit.
I've confirmed pulsing on the BLNK- signal at 60hz
I've also swapped U5 (74HC74) and U4 (74HC151).
I've swapped the CRT.
Curiously I need to have t
I have also long been interested in doing neon tubes for fun, as well as
lasers and other fun things. I have both diff pumps and a turbo pump which
I want to configure into a vacuum workstation built on an old
ultracentrifuge chassis. So I was looking at neon sign electrodes as a
possible startin
