I was setting up to do some studio work and the volume died after a minute or so. The valves have been making a few crackling noises and one no longer glowed so I just figured replacing that would be the thing. Swapped out the power amp valves. Both new ones glow nicely - but there is absolutely no sound at all. Swapped the fuse just in case there was an issue there (didn't seem to be but I did it anyway). Have tried different cables, speakers and speaker leads - still nothing.
Any other ideas? I have a lot of studio work coming in the next fortnight as well as a few gigs and this is the only amp I currently own.
Last time I checked the closest official repairman in Australia was 1000 km away - so can't send it there given y time restraints.
Any advice would be greatly appreciated.