Just finished up a really fun project that kind of evolved based on the parts I had on hand. I had a straight-faced Fender Princeton Reverb chassis laying around with pre-cut tube holes. I also had a nice power transformer that would give perfect B+ voltage with a diode bridge rectifier. Decided to build it and realized I'd have an extra octal socket since I wouldn't be using a tube rectifier. What to do with it? Finally settled on using an octal 6SL7 instead of 12AX7 in V4. So that took care of the open octal socket. But now I'd have an open 12AX7 hole. What to do with it? Finally decided to use it for an extra preamp stage, which I ended up voicing like a Marshall Plexi (tiny bypass cap, larger load and cathode resistor, etc). I put that in the original V1 position on the chassis and bumped the other two 12AX7s and 12AT7 over one spot to the left. Now with two independent channels but only one input jack and tone stack on the control panel, I ended up putting the input jack and plate outs from each channel on a DPDT switch. So in one position I'm getting the stock Princeton tonestack and in the other, the new Marshall-y channel. I ended up screwing around with the amp a lot more. Added Lar-Mar master volume, mid pot, bias test points, bias pot, and ran the ground from the mid pot to a foot switch (with 100K resistor across switch) to give a nice gain boost with the switch open. The resistor keeps a little bit of the tone stack flowing. Without it the gain boost was HUGE. Now it's at a nice midpoint I think. The chassis shot is an older one before I finished up. You can see two feedback resistors on a switch. Ended up taking that out after settling on the number I liked more. This is also before I neatened up the wiring a bit and ran shielded wire for the gain boost to a jack at far right. As for the cabinet I was out in California a few weeks ago and saw someone playing on a beautiful Matchless amp. I loved the backlit nameplate so I decided to give it a try. It works and I may do this from now on! The grill cloth is from the early 60s (old junked Hammond amp) and the knobs are vintage cool rounded chickenheads. I inset washers under the tolex for the chassis mounts, and drilled out some silver mercury dimes for on top of the Tolex. Why not? Also put all the controls that are usually on the back of the chassis (fuse, power cord, reverb stuff, footswitch jacks, etc) on the bottom of the chassis, so I wouldn't have to use back plates on the cabinet. I wanted to go for clean simplicity. The second channel bit took a little while to figure out but with some help online it's everything I hoped it would be and really adds a new dimension to this amp. I have a Celestion G10 Vintage speaker in there now.