Tube burn spots, white dots, and green splotches

[Mondomark]

Hi Gentleman -

Firstly, thanks for taking the time to watch the video and provide helpful comments. I'll give the white card/open iris a try for the Saticon burn spot, and maybe it'll fade. After the incident, I left the camera alone for a week or two, and when initially turned on, it wasn't as prominent, but as shooting continued, it became stronger, if that makes any sense. After not using the camera for 1.5 months, the burn seemed even less severe, but I wonder if the activation of the tube also warms up the coating and 'brings out' the scarring. As for the three white dots, pity it isn't something like a bad capacitor, as I gather that could be fixed.

The green blotches are a little amusing to me because I've only encountered them on single Newvicon tube cameras. I found a second Sylvania VK747 in better shape, and yet it has the same green misalignment; same goes for a JVC GX-N70U which is a much better camera. (Would love to be able to fix this one, as it's a nice camera.)

Is a beam alignment something that must be done by a technician? I've also heard of one incident where an open iris set to a brightly lit green background worked after a few hours, but perhaps that was a fluke, or only fixable with a higher grade tube.

Have to say I'm not impressed with Newvicon tubes as they seem rather cheap in quality. Some base-level consumer cameras with single tube Saticons still work great, and I'm impressed by the resilience of single tube vidicons in older cameras like a Panasonic PK-200 (although the size and weight of these monsters is extraordinary).

Cheers,


- MRH