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Cheap triax connector ?
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macboy:
I have a few extra Trompeter (Cinch) brand PL75-55 connectors. I'll part with one for USD $15 or two for $25 shipped. PM if interested.
These are technically made for "Twinax" cable which is a shielded twisted pair, but the all important mating surfaces are identical to Triax. They are 3-lug (un-keyed, 120 degrees per lug), as in your pictures. I don't think it would be too difficult to mate these to Triax cable... the most difficult part would be getting a good connection with the inner braid, which would likely require soldering since it is not designed to crimp to it (it will crimp to the outer braid when assembled). You also need to solder the pin. Here is a photo of the exploded connector shamelessly linked from digikey:



p.s. Please check if you need 2-lug or 3-lug connectors, as the Keithley 220 came with 2-lug connectors originally. Yours may have been modified by a previous owner, as 2-lug triax is especially rare.
michaeliv:

--- Quote from: macboy on March 04, 2016, 04:55:20 pm ---I have a few extra Trompeter (Cinch) brand PL75-55 connectors. I'll part with one for USD $15 or two for $25 shipped. PM if interested.
These are technically made for "Twinax" cable which is a shielded twisted pair, but the all important mating surfaces are identical to Triax. They are 3-lug (un-keyed, 120 degrees per lug), as in your pictures. I don't think it would be too difficult to mate these to Triax cable... the most difficult part would be getting a good connection with the inner braid, which would likely require soldering since it is not designed to crimp to it (it will crimp to the outer braid when assembled). You also need to solder the pin. Here is a photo of the exploded connector shamelessly linked from digikey:



p.s. Please check if you need 2-lug or 3-lug connectors, as the Keithley 220 came with 2-lug connectors originally. Yours may have been modified by a previous owner, as 2-lug triax is especially rare.

--- End quote ---
Thanks, but I do indeed need a 2-lug triax connector. I didn't know that there were different types so I just slapped in a photo that I could find   :-[.
rastro:
Keithley and possibly Trompeter make  triax to BNC adapters.  There are obvious trade-offs going to BNC (2-conductor vs 3-conductor) but it may be acceptable for some applications.  The Triax cables are also very expensive. 

zucca also wrote about converting his 220 to 3-spade triax.  Looks like some of the original pictures are missing???
https://www.eevblog.com/forum/testgear/keithley-220-output-triax-connector-mod/

-rastro
woodchips:
Where are you? Not really worth posting overseas.
michaeliv:

--- Quote from: woodchips on March 04, 2016, 08:43:07 pm ---Where are you? Not really worth posting overseas.

--- End quote ---
I'm in the US, and already checked and there is an ocean in between US and UK :(, thanks anyways.
I don't _*REALLY*_ need it, I'll manage with a hacked in connection, I wouldn't benefit that much from the extra isolation.
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