Quote:
Originally Posted by timmy
hv is all over with scene changes, clearly hv cant keep up with demand for whatever reason so far.
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I am not sure what you mean by "can't keep up" but if you mean the HV is not regulated then then the reason is:
1) HV shunt is not operating correctly (a missing jumper would for sure do this as an example)
2) there is not enough HV in reserve (so the shunt has nothing left to shunt, and the HV drops) this can be a weak tube or other problem in the HV system.
3) CRT load too high from incorrect setup or defect in circuit or bad CRT.
Answer the following please (in order)
What is the HV (in kV) with the shunt tube cap off and the brightness all the way down? Make sure the tube cap is not near anything as it will arc.
replace the shunt tube What is the HV now(in kV)?
brightness up
brightness down
with brightness down does the HV adjustment pot have any effect on the kV?
Its important to answer the all the above questions prefer in that order asked to try and figure out whats going on. It would help if you would quote this and answer each question.