It was designed and tested with a 50W SECA DESIGN but nobody was interested so I scraped it.
Possibly because 50W class A is a lot of heat to handle, may have been more interest in the 10-20 Watt range, I put my 20W pp class A to bed for summer because of heat and it just feels wrong to use it, single ended 50W, yikes!.
Try 300W Mono Blocks idle power each 1800W
https://www.flickr.com/photos/86232481@N04/7898414060/in/album-72157634060446500/