07-02-2021, 11:32 AM
Thank you I found some info on Radio Museum. It's a long time since I have worked on CRT equipment. I have an interesting problem
with this spectrum analyser CRT. When I got it I found it had a mod (unofficial) it had a 220 meg resistor strapped between the second grid and earth. I removed said resistor that was just pushed into place and the brightness creeps up to excess with no control. I put a meter (Avo or Digital multi meter) and it becomes correct on the screen. the voltage looks right 330v as soon as I remove meter it creeps up slowly until it's far too bright. The question is is this covering another fault or is it decoupling capacitors?
with this spectrum analyser CRT. When I got it I found it had a mod (unofficial) it had a 220 meg resistor strapped between the second grid and earth. I removed said resistor that was just pushed into place and the brightness creeps up to excess with no control. I put a meter (Avo or Digital multi meter) and it becomes correct on the screen. the voltage looks right 330v as soon as I remove meter it creeps up slowly until it's far too bright. The question is is this covering another fault or is it decoupling capacitors?
