Made in the early 1960s, the Joker was a combo, rated at 25 watts, with a built-in valve Copicat. The output stage of the Joker is twin push-pull EL84s, same as the Vox AC30.
Many thanks to Bernard for the following pic showing his Joker alongside his Rapier 33 guitar :-
And thanks to Liam for permission to use the following pictures of his Joker –
And here’s a catalogue extract describing the Joker –