I started a transformer thread about most of this recently, but since it's all nearly come together I thought I would dedicate one for it. I built another one of these for a friend who's actually gigging these days down on Alabama gulf coast area, and he wanted a 12W-15W barn burner amp. I made a few changes from last time: 2.2k bias resistors on both halves of V1, 220k plate resistors, added a 470k screen resistor on the power tube. He wanted it hot and ready, so I left the second gain stage bypass cap hardwired, where last time I switched it as a boost. This time I used a 2.7k and 5.6k NFB option on the switch. ClassicTone is gone, so I used a Hammond 125ESE OT....I'll go with a 125DSE next time! This thing is massive! Bolt spacing is wider than the chassis so I had to mount it at an angle. It's probably the size of a 30W-35W push-pull amp OT. Hammond 290AX PT, and a 5u4 rectifier again. A left it turned on maybe half an hour today, chassis turned open end up on the workbench, just letting things get hot. I had a little crackle in the heater wiring develop after yesterday, so I touched it up and left things to get get toasty. Interesting observation: I checked things with my infrared thermometer. I used a 10W 300R bias resistor, so it's pretty big. The ground side of it was 20+ degrees hotter than the cathode end. I checked it a few times, moved it slowly across the entire span. The open chassis was face up, so heat could easily rise, and the + side was closer to the tubes, but the ground side was significantly hotter. I'm hoping to get some real mic'd clips done this weekend, but it's a beast with a 1258 speaker, especially with humbuckers! Not exactly an amp to be picking the Wildwood Flower, but if you like Black Keys and blues/rock, it's brings some heat! Now, to finish the cabinet. The only clip I have so far, but I've changed it a little on the NFB since then. This is with a Telecaster and the amp on 6, but it has linear pots, so that's relative. I think that was a 12ax7 in V1. A 12ay7 and input #2 actually keeps some really nice cleans if you try.