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Dear John,

I think that overriding concern was preserving MCP, which even overshadowed
concern for phosphor. It appears that brightness setting is significant
factor in time out. I seem to remember reading that shutdown is forced after
so many Coulombs (ampere-seconds) of beam. The whole scope is processor
controlled, so it might be pretty tough to fool it. A possibility is to
fudge beam current sense, but that might effect intensity setting control
and certainly would jeopardize MCP. It makes me dizzy to even think of the
price of replacement CRT for that scope.

It seems to me that better way would be to learn what parameters effect time
out and work with it or around it. In years that I worked with one of those
there were times when it did just fine and than it would get temperamental
(or it was me who would forget to set it right). Fact is, I never spent time
to find out what is right setting, I just kept pushing this Beam Finding
button, to reset time out.

However, if you find a way, please let me know. I have one and do not have
manual yet and I guess I do not have guts to attack that shutdown, though it
annoyed me almost to the limit of my patience.

Regards
Miroslav Pokorni