If you have a very-high impedance voltmeter, you might want to check the voltages while the CRT appears "normal". I suspect you will see notable differences between your measurements and the schematic.
Even a DMM with the standard 10Meg input impedance will overload the circuit. You need to make a 10X attenuator for your DMM, such as a 90Meg series resistor (easiest to make it with nine 10-meg resistors). The attenuator will need to be calibrated by measuring a lower with and without it, and confirming the readings differ by 10X. Back to the blanking question, you should be able to confirm it works with an AC source such as an audio oscillator; the blocking capacitor wont allow you to do blanking down to DC. On Wednesday, November 5, 2025 at 6:16:35 AM UTC-8 Tom Katt wrote: > What would happen if I added a bit more resistance to the cathode to > provide about 40V differential between the 1100V supply so I could use some > kind of switching to put the 1100V on the grid for blanking? That would > probably affect the overall bias a bit, but maybe the various adjustments > for astigmatism would compensate? Maybe I could come up with some kind of > optocoupler arrangement as used in David Forbe's design... > > -- 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, visit https://groups.google.com/d/msgid/neonixie-l/208cbbab-3517-4ee0-8deb-75ba7c3979abn%40googlegroups.com.
