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[Kevin Maxwell]

I have seen those terminals a lot on Neutrik XLR connectors I have been given to solder. Not my favorite but usable. I usually just cut off the chassis terminal. 

[Robert Lunceford]

I ordered some panel mount XLR-M connectors, NC3MDL-BAG.  They're listed as having solder cup connectors. What I got is pictured below, with terminals that have a center pin surrounded by a spring.  I've never seen this before, although don't get out of my corner of the world that often.  What is this?  Searches for combinations of Spring Terminal XLR Neutrik Solder Connector haven't turned anything up.  Did I get an incorrect part, or is this some new solderable solution?

Thanks,
Ben

I have a Whirlwind Medusa that I purchased in 1986 that uses those spring solder terminal XLRs. The XLRs are branded as Whirlwind. That snake is the oldest piece that I still have in service. It’s been used on almost every job I’ve done the past 33 years

[Mark Cadwallader]

I guess that I would think of the interior of the spring as cup that fully surrounds the wire, so you don't have to hold the wire "down" in the cup to solder it. But maybe I'm just really wrong....

[Mike Caldwell]

I have a Whirlwind Medusa that I purchased in 1986 that uses those spring solder terminal XLRs. The XLRs are branded as Whirlwind. That snake is the oldest piece that I still have in service. It’s been used on almost every job I’ve done the past 33 years

Same here.

Would not be my first choice in solder connections, but workable.

[Scott Helmke]

I have a Whirlwind Medusa that I purchased in 1986 that uses those spring solder terminal XLRs. The XLRs are branded as Whirlwind. That snake is the oldest piece that I still have in service. It’s been used on almost every job I’ve done the past 33 years

Whirlwind does seem to like those springs, because it's on most of their chassis XLR connectors. 

Maybe it's a way to turn a PCB pin into a solder cup?

[Brian Adams]

I don't love spring terminals, but I've had to work with them a lot and they're OK. Why Whirlwind loves them so much I'll never know.

In any case, that doesn't look like any NC3MDL I've ever seen.

[Ken Braziel]

Seems like it could be a form of strain-relief, so if there's any play between the exterior where the connection is mounted and the board it's soldiered to the springs would give. Also vibration... just a thought

[Mike Caldwell]

Seems like it could be a form of strain-relief, so if there's any play between the exterior where the connection is mounted and the board it's soldiered to the springs would give. Also vibration... just a thought

By the time you solder them they are pretty much solid.

Like Scot said they look like a PC mount XLR with a spring cup on the pins.

[ProSoundWeb Community]