So I couldn't sleep. Started to wonder if it was time for a new amp build. Have probably most of the parts for an 18 Watt type. Minimalist or Lite IIb appeal to my sense of elegant simplicity. As do cathode bias output sections. Maybe a Matchless Spitfire. But with 6V6s because I can't be arsed with tiny valve bases. They are neither elegant nor simple now that I need glasses. Still couldn't sleep so read a bit of my Valve Wizard book and saw the cascode section. Seems a whole lot more elegant and just as simple really as the 'what the hell shall we do with the leftover triode?' parallel input stage. And I have some 6N1P valves gathering dust which are reckoned to work well there. So a (fake) pentode into a long tail. Isn't that just an old style AC-15? Fair enough, but maybe there's something else I can try. Be a bit more creative. Do something different. Oooh, paraphase inverters. Rough and off balance just like I'll be if I don't sleep soon. And definitely simple. So simple I can draw the schematic in my head right now. Let me Google 'pentode paraphase guitar amp' for any tips... Pentode (well, cascode) -> Spitfire tone controls -> Paraphase -> 6V6 cathode biased output section. Oh, it's a Gibson GA-20. Has anyone built one? Or got an original? Even just played one? Any thoughts or suggestions?