9100Bs freshly acquired, weird variations

[tubenewb]

Hey there! New here, and new to vintage HPs. I have come into possession of two 9100Bs and a 9125. They’ve long been neglected, and I’m cleaning them up in anticipation of attempting to get one running.

So the question I have is that the power supplies are different. One is as you would expect, big thick wires, standard look. The other back panel is abbreviated, with a single plug, no s/n plates, and a much thinner wire running between the plug and power supply. The plug is also a different shape and has a 115/220V switch.

I’m quite confused. Any thoughts are welcome.

https://i.redd.it/5s51k5y7a3g21.jpg

https://i.redd.it/r96dutzojlg21.jpg

https://i.redd.it/wzojz20pjlg21.jpg