I have been using a very nicely modified Sumo Nine for the past several years. It is pure Class A factory rated @ 60 to 8 & 120 to 4. Actual after mods it does 90 to 8 & 165 to 4 never leaving Class A. It is driving 4 ohm speakers. I use a Coda CL Preamp. Yesterday I received Abletec Modules, I need to do some testing and am planning to mod those best that I can, so it will be a month or so, but if there is an interest, I'll report the results.
Tim