i'm thinking that it has less to do with amp and more to do with player. There's nothing there I don't think the axe couldn't do if you could play it. which i can't. I agree with sixtring, really nice how he keeps going from clean to coaxing feed back without it taking over. Really great control over his sound. Love the playing.
After going to the site... I find this interesting:
The Concorde is a single channel amp and does not have reverb, a master volume, an effects loop, foot switches, pull pots, transistors, chips or anything else that would degrade tone, harmonic complexity or touch sensitivity.
yet...
The amp was attenuated using a Ho attenuator and a TC 2290 was used in its loop for the delay. There’s a bit of reverb used at mix down. Jack used a Marshall 4x12 with G12 H30s for the session and ran a delay out of a separate 2x12 open back cabinet using two Scumnico speakers that bled into the mic.
so if I understand correctly, they cranked it all the way up, then backed down the volume with the attenuator? Then added delay and reverb.
and funny how a track can lead you places - the inter-web..:
Ho Electronics Some interesting stuff.
and here's jack's review of the concorde:
http://www.tgpwebzine.com/?page_id=1213
Seems he reviewed the 19 as well.