I saw the schematic on a thread at FSB and drew up a vero for it. with 3 dual opamps (3 X OPA2134's), I couldn't get it to fit in a 1590B so I just made it 1590BB compatible at 33 x 18. IMO, this is a very nice booster that is capable of light overdrive, with flat as well as two mid boost freqs with the three way toggle. here's my verified vero of it:
on mine, I removed the second from the left 1n cap so it would be a little brighter.