Jimmy Page was looking around in the 80s/90s for a style of vox amp he’d used before, with switches on the front, and big kt88 valves…

Carl Nielsen supplied him with at least one, a ul-7120; two of them can be seen here in the video.   One that Carl supplied seems to have had the voltage selector area blocked off;  this sometimes happened on some of the Scandinavian supplied Vox amps, so possibly it was originally sold there, or it was just modified later.

Great taster of the programme, some out-takes on youtube –