On a teams video call with a work colleague & he had his guitars on wall and I noticed under them was a Kelly amp on top of a matching 4x12 cab and (in view of his name) asked if any relation. Turns out he is John Kelly's grandson and he also had the Kelly version of the Selmer treble n bass 50 on another shelf. John used to work for Selmer but then went off to start up on his own to make 'improved' versions (these were the days before patents were as common, I'm told).
Just thought I'd share as an interesting aside should anyone here have a Kelly amp or be familiar with them or even have worked on them!
https://www.vintagehofner.co.uk/selmer/kelly/kel.html
I started out with nothing..... but I've still got most of it left (Seasick Steve)
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https://www.vintagehofner.co.uk/selmer/kelly/kel14.html
Front panel controls, pretty good condition!