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Much of your video drive experiments I find facinating, and would like to learn more about.
However like Nick and John I would not try to elevate the HV. These sets are plenty bright at 25KV, and any gain from running it high does not sound remotely worth the risk to me.
I reciently revived a CTC4 and on the first run in which I had good video I let it run about an hour, and even though no damage was done, by not preforming the sam's horizontal adjustments, I was kicking my self when after powering down I found the flyback to be warm. If I can't get a fly to run cool and or within factory specs it prevents me from being able to fully enjoy a set as I become paranoid over the possibility that I may be ruining an IMPORTANT piece of a prized possession which I can't readily get a replacement for.
A flyback is like a good car if you treat it gently, and give it the proper care it will out last you, but if you ride it hard and push the limits enough it will eventually fail catistrophicaly.
I guess you are not subjecting it to the worst conditions a fly has endured, but you are still rideing it kinda hard. What you do with it is your business, but if you don't want to be looking for another flyback please make sure to carefully monitor it, and be prepared to pull the plug at the first warning sign of failure.
Good luck! Here is hoping you don't toast another rare fly.
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