Thought I'd get the 2nd spare Hantarex out to see if it was any better than the other. Well, this one turned out to be a 900.
So, I have the 900 that was in the Joust, a spare 900 and a spare 900E.
Aparantly the HV cup is/has been a problem on the spare 900, as is looks like they tried to glue it tight. Anyway, the spare 900 was as dead as the spare 900E so they're going to need some good investigation.
In the mean time I tried the 900 that was originally in the Joust as that one was at least working (a bit). Found the problem why there was no picture, there was a loose pin (that goes to the "separate" pin on the CRT). Strangely this has a separate "clip" on the neckboard and that was loose. Put it back, and picture again. Here's the pin on the neckboard, it has the thick brown wire:
Now, the picture has a problem. With games like Defender, Joust and Robotron, everything seems to have a halo around it. With Bubbles it gets so bad (because of the full screen graphics) that it completely washes out.
I have a feeling this has to do with too low HV getting to the tube. The HV-cup could well be the issue as I can still hear the HV "sparking/hissing".
Does the cup really need to make a total vacuum ? I guess I will need to replace the cup anyway.