Standing on the shoulders of giants https://robrobinette.com/RR763_BLACKVIBE.htm and using up a cache of octal tubes from a couple '50s reel-to-reels. The proper Blackvibe is based on the AB763 Normal channel, but at the bottom of the page is some discussion of building the AB763 Vibrato channel to add reverb but deleting the tremolo. That was my primary inspiration for this. I've got a chassis, a set of transformers, a set of tubes, a spare combo cab. I'm missing most of the caps, pots, and some hardware odds and ends. Whether the parts order goes out in September or in December depends on how the beginning of the semester goes. Plenty of time to gather some feedback. My chassis has one slide switch opening where you'd find a Bright switch. I don't want a bright cap, so I'm deciding between a switchable mid frequency shift or a Rivera-era mid boost or a Vox-style bass cut, each of which I've used in other amps. Or maybe something else? Headroom? Bias? My 6SL7 gain stages will each be lower gain than 12AX7 stages, and my 6SN7 long-tailed pair PI should have less gain than a 12AT7 LTP PI, so I anticipate playing it w/ the volume control set higher than a proper AB763 Deluxe Reverb at similar room volumes. I'm interested to learn if this brings more preamp flavor into the sound or less. More touch-sensitivity or less. Might need a choke. Tone stack calculator with the mids resistor set around 6.8k and using various caps. White is the Super Reverb, yellow is the stock configuration for many other Fenders, red is the mid-shift setting shown on the schematic above, blue is the mid-boost from Rivera-era amps where a 2700 pF cap is paralleled with the 250 pF treble cap. I don't remember liking this sound, but included it for completeness' sake. Gotta use that switch hole for something!