On Sat, 20 Apr 2019 23:07:50 -0700, you wrote:
On Sat, Apr 20, 2019 at 07:39 PM, Harvey White wrote:
the 2467B may be
different,
Hi All:
I remember something about an limiter circuit to limit the anode current, when driving the CRT hard (displaying a bright trace). That circuit was supposed to keep the maximum brightness to a safe level and to protect the MCP from aging too fast.
Don't remember any CRT timer... or warnings about limiting brightness... could be an option in the software?
Also, if you run the self tests, you can see how many times it has been powered up, and I think... the total number of powered on hours. (the lower the better, for CRT life.)
Since the 2467B is mostly software driven, and the 710x series is
hardware without a bit of software, I can see the mechanisms being
quite different. The idea, though, is much the same. Not at all sure
that the 67B will have the same problem, but I'd be suspicious and
take it easy until I knew definitively if there was a problem.
Trying to minimize the time that the CRT is set for an extremely
bright horizontal line and left on for hours.... Seen that one.
Harvey
Best regards and wishes.
