Quote:
Originally Posted by timmy
well i will tell you i have done this befor with the reg tube cap off but now the chassis is on still on top of the cabinet and each time i have done this it did go to around 25kv and also did it with the crt plug off as well its only once the crt plug is put back on then the hv drops and it has been said that something is loading it down. either in the circuit or the crt itself.
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If you are getting no more than 25KV with the reg cap OFF--then the HV ckt is not producing enough HV. With the reg out--it should make it to at LEAST 30K--unloaded or with no raster.
This might mean the drive is not good enough--or maybe the damper ckt is not working well enough, possibly that "boost cap" the one off of the damper tube--where the boost is taken from--is bad. BTW--I do NOT think the HV adj. will work at ALL--if the regulator is out of the ckt. BTW--not sure on this chassis--but SOME horiz. ckts, have a resistor that comes off of a positive supply, designed to keep the grid from going too negative. If it goes up in value--this happens...and you get low HV and other problems. It is likely to be a high value one--100K or more. I recall Jack Darr or someone, talking about this in an article--I think in a PF reporter magazine.
And--do NOT forget to check and see if the B+ is up to snuff. Not sure what it should be--but I would say at LEAST 375V...WITH proper load. Maybe more-much lower--and you WILL have problems ALL over the chassis.