Attenuator for a solid state amp, indeed.
About as much good as mens tits.
kind of have to agree with this.
I also think if you want to play metal you might want to forget power stage breakup, and concentrate getting a hi gain tone from the preamp, and using a pretty clean power stage to push it.
I'm sure most people don't push their power tubes into break up.
I use a various head, all roughly around 100watt, and I know that even with an attenuator, im not pushing my amp hard enough to get power stage break up I don't think. There is the problem where you HAVE and attenuator and deliberately try to get power tube break up, and that can be dangerous because you can end up thrashing your tubes really quickly, shortening tube life, in some cases red plating your tubes.
just thought id mention that.