I can understand lager chillers or lighting triacs causing clicks and bangs
and noises off but blowing fuses on 2 Marshall valve amps at the same time
and no other pub mains problem showing itself.

The 1987X from 2006 in front of me kept blowing 500mA HT fuses after the
initial failure. Not doing so now its in front of me, not fully checked out
yet. Mains fuse always ok , just the HT one repeatedly failing after 4
seconds or so. At the same time as this HT one failed the mains fuse failed
on another Marshall connected to the same supply - that one just required a
change of mains fuse and is still ok.

Could a fault causing failure of HT fuse on one amp cause the failure of
mains fuse on another amp , with no pub wiring problem at all, even problem
local to the power ring/spur to the stage.


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/