On 4/5/12 2:35 AM, morrisodell wrote:
... I think there are also
very long persistence orange phosphors which work the same way...
I have a couple of 3JP12 tubes with long persistence orange phosphor.
That phosphor is VERY delicate, and has a ridiculously short lifetime
when run at a brightness that's visible in a normally-lit room. Thus,
it's no good for scope clocks.
Incidentally I was driven crazy while developing this clock because I
was using an old Solartron scope which had a P7 CRT for a test bed . I
couldn't get the origin of the hands to stop rotating with the scan.
It turned out to be the very poorly designed deflection amplifiers in
the scope that were at fault. It's amazing to compare what Tektronix
was doing at the same time in the 1960s. Such a thing would never have
happened with one of their scopes. Crap British engineering of the
60s wasn't just confined to their cars :-)
Tektronix scopes were head and shoulders above anything else produced at
that time. I have no qualms about copying their circuits, since they are
very good circuits that I wouldn't be able to design myself in several
years.
--
David Forbes, Tucson AZ
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