Kevin Lightner completely restored this modular with new jacks, pots, switches and knobs. He also put in a new linear power supply. This unit also has a couple of nice modifications. The 921 oscillators now have high quality, ten turn front panel pots installed, the op amps were changed to low drift units at critical points, and the internal tuning trimmers were changed to 10 turn Cermet trimmers. In addition, both 911 envelopes now have standard 1/4" gate inputs along with a "gate on" LED and a manual trigger pushbutton. The Moog can now directly interface with Mark's Arp 2600. All this was done with no additional holes drilled (The unit was previously modified with multiples installed on the 903 white noise generator.)
