Hi Sam,

On Wednesday, 5 March 2014 21:16:34 UTC, Samuel M. Goldwasser wrote:

The tube probably IS at least one of the problems assuming no one has

messed with the mirror alignment.

Ah, so I'll look into sourcing a bottle of helium.

There's a range of current that would be OK. I'd suggest increasing it

to 7 mA. That should stop it from dropping out. I don't think there

is anything wrong electrically but the tube has leaked. If you can run

it for a few hours or days, it may recover at least partially.

I've turned the current up to 7mA and will see how it gets on. Any idea why the voltage is only ~2.7kV and what I could try to get the exciter output back up to 3.7kV?

Looking into the end of the tube the optics do look grubby, but I get the impression that attempting to clean them may not be helpful.

Thanks for the advice, it's much appreciated!

Regards,

Andrew