You STILL haven't said if this is for a REPAIR. It sounds like you are
trying to build a project that you found in a magazine from 1967. If
that is the case,
an LM555 would probably be a *much* better way to go: cheaper and far
more readily available.

The relay/timer is part of a 25-30 year old mass spectrometer. It was
working fine until something in the relay/timer stopped working.
I had a spare, I popped it in and the mass spectrometer is working
again. I have no more spare relay/timers so I want to fix the one I took
out just in case the replacement goes.

I'll have time to put into it in about 2 weeks.

Thanks

Alp