If you're building your own amp, you may as well build one big enough to gig with - the amount of effort involved isn't that much greater, and it's not that much more expensive either. You can always turn a 100W amp down to practice in a bedroom, but you can't turn a 5W amp up to do a gig.Bear in mind that for bedroom players, 5 watts is plenty loud. Deafeningly so.
So you don't need an enormous amp probably. I built a Fender 5f1 champ circuit amp. I'd probably build a slightly larger amp next time. Not for the volume btu for the features.
No, not really. A 100w amp won't distort at low volumes.You can always turn a 100W amp down to practice in a bedroom
You don't overdrive a transistor power amp anyway - it sounds absolutely dreadful. You turn the master volume down and the preamp gain up, the design posted (in common with most guitar amps) has clipping built-in the preamp for this specific purpose. So it will distort perfectly well at low volumes, and even at no volume at all - although that would be pretty pointlessNo, not really. A 100w amp won't distort at low volumes.
As with anything, the bigger the amp, the more reserve you've got - a 100W transistor amp is easy and low cost to build.If the guy wants to gig he should build a bigger amp however, 40watts would be about right. Huge amps aren't needed as much anymore as most halls have PA systems.
I was talking about tube amps. Hmm OP said nothing about tubes.a 100W transistor amp