20 minutes ago I finished modding my 1987x. Tried it and it sounds pretty good to me. Haven't cranked it up higher than 8:30 o' clock for longer than a second, but I can say that at low volume levels it sounds better than any attenuator I have tried so far. Pics: Before starting: 5K6 swamp resistors installed: Gnd5 and QR wires and 220k resistors removed! Bias wire installed: Installed the other wire: Under the PCB: Wires that go to pin 5 of the power tubes installed: Wired up the pot: Hole drilled in chasis: Ready to install the pot: Ready to put it back in it's cabinet: Done! Cheers!