Dumble 102 50 watt | AA Electronics PCB

Just finished 50 watt Dumbel102. It is fully functional after resolving some issues which I will list below

This is built in a Bassman chassis, which you can get on eBay standard drilled for 75 USD. I drilled additional holes for presence, standby and power in front. On top I enlarged one ax7 tube hole for the XLR, put the power jack in the unused power tube hole, and in the back drilled for the PAB and OD switches. It worked out pretty well. Then slapped on the worlds worst paint job.

Issues with this build were

#1 B+ power caps, problem: 22uf caps wired in wrong hole, solution: found right hole. Identified before first powerup.

#2 FET input not working, solution: wired tip to FET and ring shunt to regular input. This is different from layout/schematic diagrams.

#3 OD and PAB switches not working, problem: ordered 24v relays, solution: 12v relays. My bad.

#4 OD not working, problem used 10k pot instead of 100k pot on v2 grid

#5 OD low volume, ground issue with shield wire on Drive Pot

Mostly my mistakes, except #2. Hope this helps others.

One innovation I had on this build was to wire it so I could open the PCB to access the bottom even after doing the Pots and tubes. I used almost 50ft of wire, but it was worth it. It is still pretty quite at low volume and gets noisier when it is cranked. Order on front panel is Input, FET, Rock/Jazz, Master, Drive, Ratio, Volume, Bright, Deep, Treble, Mid, Bass, Presence, Standby, Power, Pilot. Back is fuse, input A/B, bias, output impedance (2,4,8 ohm), send/receive, OD, PAB. Transformers are NOS Classic Tone Twin for power, Bassman for output (50watt), Hammond choke and 6v power (relays). Tubes are Tung Sol 6L6GC and mesa 12ax7. Sounds pretty sweet. So may options for tone.