I just converted my Keithley 417 to a solid-state front end, with good
results so far. This is my last electrometer that had a 5886 tube front
end, so I'll be getting rid of my maintenance stock of these tubes soon.
If anyone needs 5886s for maintenance of old Keithley and other gear
while keeping them in original stock condition, let me know.
So far it looks like I'm done with tubes for these applications. As the
new design is refined, I'll put up info if anyone is interested in
possible upgrades to the old gear. The new setup is looking good, with
only about 1-2 fA bias current at room temp, about ten times better than
the original spec.
Some background is here:
https://funwithtubes.groups.io/g/main/message/65994
Ed
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