HP-46/81 Case, Power Supply

[Duane Hess]

Should mention, always (or almost always, forget) when the printer was shut off the unit worked OK; unless the buffered-keyboard display was installed.

Seems like the longer the printer ran, the worse it was.

All the 81 parts (motherboard, printer, keyboard, display/buffer) were from an HP service kit. In the original boxes, bags were all factory heat sealed. 100% sure all parts have never been used.

Obtained them from a former HP employee who obtained them at interal to HP yearly surplus sales. Think it was obtained about '73-'74. So unless the parts are powered on during manufacturing for testing all electrolytic capacitors have never been powered on for over 40 years.

That being said likely all caps have ripple in them. Don't have an oscilloscope, so who knows.