Mellotronists

Does anyone know how DK recorded his MKII #123(?) for the video he put out 
which demonstrated the sounds on that particular instrument?  If I recall 
correctly, the guy playing the covers of "Court" , "Watcher" and the various 
Moodies tunes did a very good job and the sound had *that* quality (even in 
mono through my TV speakers).  It was obviously run through a reverb at some 
point, but that's all I could tell.

Ken M.