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Weller uses TRS too. In my experience the connection is a little flaky, but I don’t know the provenance of the lab irons I’ve used; it wouldn’t surprise me if they’ve been abused.

https://www.weller-tools.com/us/en/industrial-soldering/prod...

Where are you seeing a TRS connector? Looks like it's USB-C everywhere to me...

We use a TRS connector between the tip and the iron. And yes, it's a lot of amps!

It's amazing how versatile a well designed analog connector can be.

Ah! I was looking around for one: not on the battery pack, not on the iron-to-cable connection, but didn't think about the tips.

So you can plug an unused tip into your Walkman's headphone jack for safekeeping...

The twist is that the TRS is the heating element.