Why is single-ended output limited to bias amps but push-pull isn't?

Think so. Don't worry, I'm sure I'll have more stupid questions for you. I haven't put power to my BA-3 build yet, so I'll certainly have a post asking how to put the blue smoke back in at some point :spin:

You've been extremely helpful on a number of my posts, thank you. Please know that I appreciate you :cheers: