[ARC5] Off topic - OS-8

[Kenneth G. Gordon]

In my stash of "stuff" I found two OS-8s: an OS-8 and an OS-8B.

I have manuals for both units.

Both "work" after a fashion, but the trace is skewed and not a straight-line.

I suspect the main problem is in the power supply section.

Looking at the schematics, I see that there are three diodes, all selenium 
rectifier types. It has been my experience that selenium-diodes become, 
after a long while, not so much a diode, but a dual-resistor which shows a bit 
less conductivity in one direction than another.

Therefore, I plan to replace them with modern diodes and a series resistor to 
keep the voltage closer to the original voltage.

What is the group's experience with OS-8(X)?

Ken W7EKB