[GrimJosef]

I'm in the 'it's far too crude ever to work' camp, I'm afraid. Resistors make bad fuses in just the same way that fuses make bad resistors. If we feel a fuse is required then we should fit a fuse. It will work more reliably when needed and cause less trouble when not needed.

The 100R is run at well over its rated temperature under normal circumstances, and while this wouldn't be too bad for the amp's expected life (5-10 years of heavy use, 10-20 years of lighter domestic use ?) after 55-60 years it will have scorched the tagboard above it and rendered itself much more prone to failure.

cheers,

GJ