by RayL » 31 Oct 2013, 10:33
The technology available at the time to make that recording would almost certainly have been film - essentially a film camera pointed at a TV screen (though the process was a little more involved than that). The sound would have been recorded separately and added to the pictures in a further process as either a common optical track (COMOPT) or common magnetic track (COMMAG). As it was the Royal Variety it is just possible that it was transferred to a magnetic film base for simultaneous projection (SEPMAG).
Whichever method was used, that poor old sound has been through a lot before it ever reached Youtube. What I am hearing on Hank's guitar is vibrato, a continuous frequency wobble, added somewhere in the mechanical film processes. It is very unfair to make any judgements about 'that sound' after the mangling it has had.
Interesting to me, as a 'thumb over' rhythm player is Bruce. No barré chords for him! It's thumb over all the way!
Ray