[ship]

I clicked onto page 45 of the parts manual disk and it shows the Speed cap. Interesting... Never seen one before or remember noting it.

Fairly basic, most likely, they are out of bench focus.
I might suggest taking all fixtures down for a cleaning before next show, and while doing so bench focusing them to their proper settings. Probably about time anyway. Though you seem to know what you are doing with caring for them.

How does the beam look in spot focus? Is the ring balanced? Since there does not seem to be a height adjustment, other than verifying the lamps are fully seated, not much that should throw off the seat height.

The contact at Altman is Jay Perez to be more specific. Good guy, one that will track down answers for you.

As for the lamps arcing and not holding well, that's wear and a good indication of a need to replace the lamp base. Are the lamp bases aluminum with large heat sinks? They have been known to have problems and are replaced by ones that are more porcelain at the base. A new base is about $15.00 so you would have to budget accordingly.

How does the product you use for a deoxident hold up to the heat? I have been testing such products for the last year or two and have my own that seems to work well but am still interested. If the de-oxident you are using doesn't hold up to the heat, it could increase the problems even more.

By the way, if you put a new lamp into an arched lamp base, all it's going to do is destroy the new lamp's base especially if your de-oxident is not preforming it's job. Same goes with a set of bad lamp pins destroying a good lamp base. Loose pins in a base will also cause arcing.

After the lamp base issues and bench focus, not much I can say. Shouldn't be problems otherwise. Loose the green lenses, that cuts down on light output.

Interested to hear more.