Funny, I was just thinking the same thing as I read through the thread on SET vs PP amps. Charles does so love his SET's. Hope he is well.
Anyone heard from Charles1dad ?
I realized recently that I hadn't seen any posts from Charles and when I looked it appears that he hasn't posted since last October. I sent him a PM but no reply. I hope that he's ok. He's a good man and I always enjoyed his contributions.