Cortes,
Amplifiers 'rated' at the same watts can in reality be so very different when it comes driving speakers.The Transformatic 300b is a true beast with huge premium transformers and an ultra over built power supply.I still have my Audio Prism Debut amp,35 watts push-pull.This is a good amp yet it`s out driven by my 8 watt 300b amp without question.
The 300b amp is much heavier(nearly double the weight) and has larger transformers and a much beefier power supply.
Robust design and power supply mean more than test bench power ratings.