Let me get out in front of this, I have an affinity for all things Lab Series. To shorten my backstory: In the 70's I drank the kool-aid while working at a music store as a kid but there was no way I could afford a Lab. Ironically it was much easier to afford a Hiwatt Custom (with sequential preamps) than Norlin's (Lab/Moog/Gibson) top shelf amp. So that's what I had. Jeez I wish I still had that amp.
Fast forward to the Nashville floods and I rebuilt an L5 that was destroyed but only the cabinet and speakers. I transplanted the chassis to a head cabinet. It became my mainstay for years thru either a Marshall 4x12 or Orange 12. Glorious amp but not very flexible.
Kevin (Aion) released the L5 as a dead on recreation of the preamp but it needed a 12vAC supply and was finicky about it as well. In my case a Yamaha supply worked well. The next gen was a separate build for Channel 1 (often referred to as the Clean channel) and Channel 2 (the drive channel with all the goodies). Both featured an onboard power module that was expensive but took a clean 9v feed and did it's magic in a similar clean way. Superb.
This version goes back to the drawing board by eliminating a few nuances/annoyances. Both channels are back under the hood with a footswitch to select them. Both channels fall under the same compression circuit. This is often misunderstood by guitar player compressor peeps in that in the original it compress's the overall output. So a 100 watt head could be reigned in to be tolerable in a small bar by simply turning DOWN the compressor knob (zero being the lowest output - full CW being no compression). In Kevin's pedal this allows you to simulate the amp sag that the original would display and also level out the volume differences between a clean CH1 setting and and overdriven CH2 setting. Or vice versa if that's the way you set it up. Reread this, because it is one of the most confusing aspects of using a Lab.
When Ty Tabor (King's X) had his Labs torn apart and redone as preamps to feed a power amp the compression circuit became useless by the nature of the circuit itself. He got all his compression by pummeling the power amp.
And when BB King used his, he dimed the Master, used no compression and gawd help the folks in the beam of those 2x12's. Seriously killing sound though. The last time I saw him I had my choice of seats (snowed out Atlantic City casino show with only a handful of audience) and had to move over a handful of seats just to get his sound man's perspective.
I'm getting long winded and I'll wrap this up.
Here's the photos. Nothing too crazy here. I cleaned up the footswitch flux to be like my hero Thewintersoldier (geebuz those are clean builds) but left everything else as ratty as my normal stuff. The enclosure is a gold sparkle enclosure from somebody (I'll edit this) with waterslide. I didn't get too crazy as I knew this was going to be for my eyes only. It was a lumpy powdercoat so I kept the detail to a minimum.

