I never thought i'd draw up a Behringer original, but once i saw this it just made sense. IC pinout is matching the TL074, as there's not that much easily obtainable info around about the original "Coolaudio Quad Opamp". I'm just guessing that the pinout matches with TL074. Anyway.. This is quite nice and relatively simple 9V tube circuit. You should probably try out other pin-to-pin equivalent tubes in there too.
I'd really like to see this one done in 1590B with a tube socket on top :P