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As an update played with the scope and can now get both channels to work and can see the calibration square wave. However, the trace is unusably dim. So I am pretty sure its the EHT supply. This is the only circuit diagram i can find https://www.edaboard.com/attachments/hv_section-gif.63458/...
The only way I can see the spot is by turning down the room lights.
Turning the intensity potentiometer reduces the spot intensity, in fact a slight turn of the dial and the spot is gone.
The spot can be moved using the vertical and horizontal adjust
I tried different sweep speeds and once I...
Hi I have a Tenma oscilloscope that was working fine, than after not using for a few months all i could find was a very dim spot that disappears as soon as I switched on the time-base. I tried following this thread https://www.edaboard.com/threads/oscilloscope-tenma-72-6800-no-trace.228452/ ...
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