I thought these looked familiar, I have product that uses them, but a version with dual LEDs. The CFFA3000 hard drive / floppy emulator for the Apple ][ used them in a floppy disc control panel.<p><a href="https://shop.dreher.net/shop?olsPage=products%2Flimit-3-per-customer-cffa3000-remote-switch" rel="nofollow">https://shop.dreher.net/shop?olsPage=products%2Flimit-3-per-...</a><p><a href="http://dreher.net/?s=projects/CFforAppleII&c=projects/CFforAppleII/main.php" rel="nofollow">http://dreher.net/?s=projects/CFforAppleII&c=projects/CFforA...</a>
Where I did my phd, we had nmr spectrometers that had to be shimmed using a console with these exact switches. I loved interacting with that console..: It was at the same futuristic and absurdly old fashioned. Futuretro.<p>Edit: oh sweet lord they're listed on ebay. Imagine gutting this things' innards and turning it into a usb input device...<p><a href="https://www.ebay.com/itm/Bruker-BSMS-Boss-Keyboard-Z012706-1268-/264459946862" rel="nofollow">https://www.ebay.com/itm/Bruker-BSMS-Boss-Keyboard-Z012706-1...</a>
I recognized the buttons immediately as they are fairly common in vintage synths of Roland, Korg and Sequential among many others.<p>And at least in my Mono/Poly the button is clearly not a single component but a combination of a tactile switch with a led and the cap.
At around the same time, 1990 - 1992, a partner and I made a rack mounted utility unit that included a tuner, a metronome, surge protected outlets and rack lights. We used buttons almost identical to these from Digi-Key. Mouser was also a big vendor of ours.
This post makes me think that I could have a blog if I could avoid going straight to the point and I could build a story around my digikey investigations