"Phil Allison"

On the PCB is a 630mA delay fuse - very blown - fitting a new one got the
amp running.

That 630 mA HT fuse should be 1 amp at least, since it is fitted in the
secondary of the PT. On test, the fuse had to pass just over 1 amp rms
when the amp is over-driven.


** Just for clarity - the 630mA delay fuse was as fitted in the factory and
as labelled on the PCB.


..... Phil