I agree, that's the sound and the touch too! Great playing.
But I did notice that the guy doing the demo just in passing...
( note: and this always seems to be the case when folks are talking about other famous guitar players' signal chains- they glide over something that may be integral to their sound- like Angus Young or Rory Gallagher- it's NOT just guitar >amp...)
... says " Brian always used this with a Treble booster, which is what we are doing today.." ( right?)
This ( IMO) is no trivial bit of information, as doesn't using one of these greatly influence how the amp is going to sound?
What do things sound like w/o using the Treble booster?
I've never used one, but aren't they really powerful, and greatly influence sound?
Just a curiosity
On the subject of Rory Gallagher (he had an AC30 in the early 70s that was modded to use EL83 valves) I bought 4 of these NOS Tesla PL83 'Made in Czechoslovakia' to try out, only £10 inc shipping. The 'P' means 300mA and a datasheet voltage of 15v, they were used in TVs with a series heater chain, I've tried them on 14v wired in parallel in a modded JCA22H and they sound sweet. Also tried with some 50's Mullard PL83 valves too, equally sweet