On 08/04/2017 02:24 AM, Rod Smallwood via cctalk wrote:
Programmers console is in its slot. Bad bulbs (not LEDs) have been
replaced
Power up and all the lamps come on either bright or dim (off) except
the RUN light.
So questions:
1. Should the run light glow dimly?
Probably all lights should glow very dimly. DEC put a resistor across
the transistor to put a slight warming current through the bulb. This
reduces shock to the filament every time it is turned on.
(This info is from other DEC machines, not PDP-8, but I'm pretty sure
they would do the same there.)
Jon
