Just read thru this thread. Wow. @KBarW , you deserve a lot of credit. A working PR is a huge achievement for a first amp build. Also, credit for absorbing a ton of info and making sense of it -- and for stating your questions clearly, admitting your mistakes, and responding to suggestions gracefully and intelligently. And the folks who pitched in here get a special award. So smart, patient, insightful about what needed to be shared — and so decent and humane in the sharing. I see this often here, but this was an all-out great example, and without the insistent 'wrong answers' and internecine flame wars that sometimes mar our efforts. Now, KBarW, a brief coda: A 10kl bias pot and a couple solder joints would make your amp a masterpiece. I like the approach described here by Doug Hoffman. Although it's clear he wrote this up in the dot-matrix era, it still works perfectly.