Thread: Zenith roundie
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  #30  
Old 12-09-2010, 08:10 PM
DaveWM DaveWM is offline
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Join Date: Feb 2009
Location: Orlando FL
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well if were not for the setting being at MAX hv yes I would prob be ok, I like to have some adj that lets me set it a little above that with room to spare.

The other issue was the excessive current thru the shunt tube, that is normal now.

I still need to check the HO current with the new setup. If the resistor does indeed check to have drifted I will have my answer. After that I will address the HOT, and any excess HV being made. One solution would be to increase the screen resistor a bit to lower the overall HV to reduce the shunt load to around .8 to .9 mA and have HV up to 24kv.

The screen resistor seems like the way to go to deal with increase line voltages. I am somewhat hesitant to just go re-engineering these old sets, but if the line is consistantly 125v it may be worth putting in some easy to reverse change to make it more friendly to modern Higher voltages.

Of couse the easist approach would be to just use the variac, which I do on some sets that get a lot of time.
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