Tokyo's "Extinct Media Museum" is quite nice, brings up many memories (phun intended..)
@globalc I really like that design of the Walkman to help you listen with another person! I have a headphone splitter cable, but it's lacking the independent volume controls and microphone, and we're running out of new devices with headphone jacks...
@skyfaller @globalc
The volume sliders on the TPS-L2 are Left/Right, applied equally to both of the headphone outs.
The design was based on an older mono voice recorder, with an external Mic input socket next to a mono headphone out. They replaced the recording capability with Stereo internally, and used the same case.
The built-in mic was used by a talkback feature, enabled by the orange button.
On later Walkman models, the orange button was moved to a 'mute' on the headphone cable.
@skyfaller @globalc
But independent volume controls for individual headphone outs is an excellent idea.
I've never seen it done outside of a dedicated headphone monitor mixer. And those are usually not cheap.

@dec23k
Thank you - I was jumping to conclusions in assuming these were volume sliders.

If implemented nowadays, I would guess they would distribute the signal via Bluetooth Auracast to multiple devices, and these would then have their own volume control.
@skyfaller

@globalc @skyfaller
Slight correction to my earlier reply: they were just volume sliders (one L, one R). I shouldn't have said 'balance' as that's usually a different control.

I was going on a memory of using one of them (with one pair of headphones).