@bitseeker re the 181
There are a couple of Amphenol connectors I believe fit, I can confirm the first one does (I have it) and it fits nicely.
One is readily available, Mouser PN 654-97-3106A-16-11P Amphenol PN 97-3106A-16-11P about USD$20
The other takes a while - I think it is supposedly better from the temp-coeff point of view but is more expensive!
About USD$40 each ! Mouser PN. 654-97-3107A-16-11P. Amphenol PN 97-3107A-16-11P
Expensive as they are they are cheaper than Triax connectors. **********!!!!!!!
I plugged it in and it proceeded to blow up 2 of its 4 its Tantalums - I was describing this to my wife and she very astutely nicknamed them "Tantrum" capacitors. Replaced them and it works OK I get roughly correct reading on both its ranges and they appear stable - I can't test it further at this stage.
I have to make a set up to generate a voltage I can then measure down below 1mV and also a "Short" and some test leads, I found some nice pure copper alligator clips and one of Pomona mini-hooks are copper as well.
Inside it looks like good / real Keithley gear
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Regards Rob