This turned into my most ambitious project yet. Started in early Spring of 2017, it was a long and winding road. In the end, I was really happy with how it turned out.

It started as a harmonica amp, but turned into a 2-channel amp; 1 for harp, 1 for acoustic guitar. Naturally, first I spent a lot of time working on a layout, as I wanted to cram a lot of stuff into a certain amount of real estate, but wanted to make everything easily serviceable. So here we are, drilled and painted.



Starting to bolt stuff in.



Heaters wired. I stopped driving myself nuts twisting stranded wire about 6 builds ago. This is nice cloth covered wire, I just keep it tight together, and there's no heater hum. Might be other hisses and pops, but no hum!! haha



Power trans wired along with other stuff, like that fancy-dancy diode board. I always make that way more complicated than it needs to be. In this case, my guy wanted a standby switch, so I made a "soft start" switch". It basically just slows up the inrush of DC current. One of many, many ideas that is not mine.



Close-up of that board. I spend that much time on something little, I'm documentin', dang it!



The board for the preamp. This is the bottom board. I had to stack the tone stack components for the guitar channel on a smaller board that got installed on top.



That's it right there!



Speaker jack with phase shift switch (to help with feedback {and it works, we tried it!!} which is always an issue with harp) and and balanced line out jack to go to the PA system.



Had to double-deck the reverb modules for each channel too. Ignore those huge pots. It was supposed to be "adjustable cathode bias" but that didn't quite work out.



Just about there!



And closer...



Almost-finished....



And with the purty grill to hide my crappy decal job. Next time I'm just painting the chassis, and then hand-painting the control letters.



And matching 1x12 speaker cab!



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