If you use a buffered effects unit such as the C-lator with either the 50 or 100 watters you can attenuate the volume down to bedroom level without affecting tone too much so there is really no need for a lower wattage.

Sort of a no frills take on the KO PS, but not an infringement, it's only Sac Longchamp Soldes $50 for fixed bias (cathode bias is $30) and universally folks are remarking it preserves tone better than attenuators -- even ultimate ones -- and much better than PPIMV. It is limited to 50 watts, so 100 watt blowtorchers are left out. The KO solutions will go 100 watts and higher.