Quote:
Originally Posted by DaveWM
After talking it over, I think I will just check to make sure that all the existing values are correct and not try to up the HV more than the design calls for. My concern is HV breaking down the insulation and arcing over in the HV tire.
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Won't happen, starting with the 5 there was a little bit of potting and a rubber insulator around the HV winding. Previous designs (CTC-4/21-CT-55) only had some wax dribbled around the bare windings, and they operated at higher voltage than the 5 does. CT-100 was different as well, it has some sort of plastic around the winding instead of wax.
It already makes 20kv, another 3-4 isn't going to hurt it. You don't have to drill a hole in the chassis either, you can use the pot temporarily to figure out what value you need. When you know, replace the pot with a fixed resistor and be done with it. The benefits are worth the potential risk, IMO. If I could get 23kv out of my set, I definitely would do it. Also, chassis for the 5 seem to be popping up lately. So if a flyback did blow, chances are you could find another one. It wouldn't be as hard as trying to locate one for a CTC-4, those are made of unobtanium.