Oooh, SWTPCo Tigersaurus amps! Don't see too many of those in the wild these days. That tickles a memory... way back in the days when AudioXpress magazine was Audio Amateur, there ran a two part teardown-rebuild article, "Taming The Flaming Tiger", a "restoration odyssey". The amp was plenty powerful, but underdesigned. It was prone to thermal problems, output-transistor-eating oscillation, and other bugaboos. If you're going to hand with these guys long-haul, you'll want to find yourself a copy of that pair of articles.