My new CTC-15

[Vaultovinyl]

I just snagged a CTC-15 for $2 at an auction. It's my first foray into the roundie world. The good: It's got a 21GVP22 with a date code of 52nd week of 1971. Absolutely no sign of cataracts! It's also had a new flyback transformer installed (probably when the picture tube was). It's very clean inside with just the finest layer of dust. The flyback and picture tube look like they just came out of the box. The bad: I powered it up slowly on a variac. I've got audio and raster but there's high voltage dancing all around the outside of the picture tube to the chassis surrounding the tube. I haven't left it powered up past the point that the arcing starts. The screen just begins to light up before I kill the power as the arcing starts. I'm guessing I've got ground issues. Haven't dug into it more than that. Anybody got any ideas? I'm new to the roundies but have been around tube gear like radios, jukeboxes and amplifiers for many years.