Quote Gerard Klein:
From the video: the rear seems to be identical on both models. So I guess no switch... although you can't see the entire back.
Sorry Gerard - I meant that it could be THEORETICALLY possible to add a DIY switch once we boffins have seen the circuit diagrams
Mike - what does the C5A loudspeaker look like once you've removed the foam grille? Does it look like the same driver unit as the chromed C50A version?