What with the remnants of the hurricane passing through here recently, there's been so much rain the grass is so green it looks fake. So what better time to again check H-V under extended high-humidity conditions.
Last night I did it a little differently. With a 115-Vac line I pulled open the H-V lead then applied power. The H-V swung right up to 21 kV (about right for a CT-100 unloaded H-V supply) and stayed there.
Plugged the CRT back in and powered up again. Sure enough, after some mild frying the H-V settled at a slightly low 17.5 kV, but in a few minutes was back up to 19.5 kV.
I believe in my case the culprit is leakage from the flange; last year after restoration I had to remove and cleane the CRT and rubber insulator around the flange to arrest the same frying/leakage.
If you have to you have to. But not looking forward to pulling the CRT for another cleaning. Not so much for the work involved, but I don't like potentially messing up a satisfactory alignment.
