It's a turret board point‐to‐point, hand-wired TMB (Treble-Middle-Bass) version of the vintage Marshall 18 watt amp. From the BYOC product page:
"This is seriously one of the most essential and versatile amps you’ll ever own. And it’s not that hard to build either! Two channels of tasty class A, EL84 goodness. The first channel is just volume and tone – great for shimmering, vox-like clean tones with that top‐end chime that you can only get with EL84s. Crank the volume up and back off on the tone control and you’ve got tones that are reminiscent of a Tweed Deluxe. The second channel features the TMB controls and a master volume, which allow you to punch up the gain, sculpt the tone, and keep the volume right where you want it. This channel is pure Marshall tone, just not as loud as its bigger brothers. Add an A/B box, and you’ve got the perfect channel switching amp for live gigs."
This is not a "bells & whistles" amp, by any means--it stays true to the vintage circuit with the one exception of an added master volume control on the TMB channel (which guitar players' wives & girlfriends everywhere will appreciate). No reverb, tremolo, or effects loop. Just six tubes (EZ81 rectifier, 3x12AX7 preamp, 2xEL84 output), two channels, and a ton of tone.
Here's what the completed chassis, sans cabinet, looks like:
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