I don't know much about Friedman. However, I did a quick search of the naked series because this amp you have is a marshall plexi chassis. Now maybe in the beginning of the naked series he was using the chassis for it. But this would definitely be a question to email to him. I hear he is a nice guy, and it is entirely possible that he started off with marshall chassis and just completely made a new circuit within rather than this just being a naked mod. Either way, bet the thing is amazing. Also, it has a loop it looks like. if you throw a volume pedal in there, you can have a very easily adjustable sweep.