(...) Is there anywhere where I could get a replacement? (...)
Hi Pete!
Not an exact one, I'm afraid - as the original is a nowdays outdated conventional (= transformer-based), linear-regulated model with the rather unusual output voltage of 10.5 V and also a somewhat unusual plug (this kind, originally intended for switched jacks: https://roka-berlin.de/produkt…ungsstecker/#content-area) rather than a conventional barrel plug. However, if you'd buy a modern (= switched-mode) universal power supply, that either is 12 V fixed or can be set to 12 V and sports a 5.5/2.1 or 5.0/2.1 (outer diameter/hole diameter) barrel plug (or barrel plug adaptors), that should work. Power consumption is pretty minimal, so a model in the range of 3 to 6 W would already easily suffice - like this one, for example: https://www.pbtech.co.nz/produ…iversal-ACDC-power-Adapte
Greetings from Munich!
Manfred / lini
P.S.: Oh, and mind you, that the polarity of the original is centre contact = plus, so if you get a universal power supply model with several adaptors, that support both polarities, you'll need to heed the markings at the end of the output cable and on the adaptor plugs.