Just got a chance to listen to the amp clips. Excellent.
Back to the 80s!!
I particularly like the Plexi clips.
Does the boost switch in another valve stage? Where relays used for the switching?
yep, the boost switch changes the structure of the amp from plexi to JCM800 (in a wider sense). there are of course quite a few deviations from either spec to get the amp sounding like a cranked plexi and hotrodded JCM800 respectively.
I used a 12v DPDT relay for the switching - first time I'd used relays, worked a treat. Instant switch-over and no pops.