On Fri, 19 Apr 2019 17:04:26 -0700, you wrote:
The LCD display on these are miserable.. An early electroluminescent backlight with a heater for cold environments, difficult to read in almost any condition. If the display is bad, ie, looks like it has a dark spot, it's gone. There were a few "improved" versions of the display assembly.
The input sampler on this model is a hybrid, not repairable, and impossible to find.
The chart recorder has a roller that turns to molasses, making a huge sticky mess.
The interesting counterpoint is that the weak point in the 1502 is the
unobtanium tunnel diode. I did have one with a bad CRT and a bad HV
power supply (and a bad horizontal amplifier). Finding one that had a
bad tunnel diode (as well as other nasty things) gave me enough spare
parts that I could construct one that worked.
Harvey
When working they are fine, save the lousy display.
