yeah if you have access to some caps to test and a Z meter, you could
probably find one stamped 1000uf thats exactly what you need.

Thanks Iain and Graham,

I'll go for 1000uF 400v to get the amp up & running again and may later
swap it if Jensens have a nearer value, though electrolytic tolerances are
quite wide anyway. The failed cap exploded violently, splitting it's can
wide open, three people in the room were temporarily deafened!

Cheers,

Mike