Andrew:
The Fernandes system is similar to Alembic - after all, it is an Alembic copy. Like an Alembic, the electronics have two single coil pickups with a dummy hum cancellor in the middle. The system runs at 18 volts. The 5-pin connector hooks up to a power supply that has both mono and stereo outs (one pickup for each channel). When used without the power supply, the batteries don't last long at all - only a few hours. Also, if this is wired like the old Alembic Series instruments, when using the 1/4 jack (battery power) instead of the 5 pin, you'll only get the output of one pickup. If this is the case, it can easily be re-wired to provide a mono output (both pickups) from the 1/4 jack. Running this without the power supply is a major disadvantage, IMHO. I haven't seen a Fernandes Power supply since they came out in the late 70's (mine came without one also), but an Alembic DS-5 or DS-5R ($550) and 5 pin cable ($190) should work with it. Be aware that while the woodwork on the Fernandes is similar to Alembic, the electronics were not nearly as successful a copy.
Bill, the guitar one