Return of Gearweigan
Its seems the creep of Gearweigan back into the article has begun: 

"In simplest terms, Distortion was caused by pushing the biasing voltage AC swing higher than the maximum power the amp itself could provide".

Sorry, but those aren't simple terms. Only someone versed in electronics geekery will be able to parse "biasing voltage AC swing higher". This is an encyclopedia article, meaning it is intended as a first introduction to this topic. A lot of work was put into editing the Gearweigan out of the article, so let's not put it back in.