For those of you who love these amplifiers (and their clones) as much as I do, I have posted a rather simple modification on the Tronola website (www.tronola.com), that significantly improves the performance of these units, and offers the documentation to back it up. It utilizes a unique new method of biasing I think you will find interesting. The article is written with plenty of how to information for the newer folks, and why explanation for the more experienced ones. If you are interested, go to the Tronola website and look for the section entitled Dave's Lab. There, you will find a link to take you directly to the article. I hope you will find it helpful in your quest for improved sound and performance.
Dave