Join Date: Feb 2003
Location: Delta, B.C., Canada
OK, I asked at the Gibson Forum, and here's the reply I got:
If the back looks like a printed circuit board then they were designed by Bill Lawrence, when he was a Gibson, and fitted from the late seventies until around the end of the eighties. I have them in my April1990 SG Standard.
The design ideas were :-
To make them easier to produce,
The PCB back makes it easier to exchange a pickup as you only need to remove the wires from the rear of the pickup and it's much quicker,
All 4 coil connections are available so the same pickup could be used in guitars that have a coil tap,
They are fully potted to eliminate microphonics,
The bridge pickup "L" is @17kohms the neck "R" is @7.5kohms this means that with both pickups the same distance from the string (3/32") the volume is the same as the bridge pickup has a higher output.
NB: Do not try to take the covers off as the coil wires are joined directly to the inside of the PCB and come off very easily.
There are mixed opinions on these Pups but I have to say mine are terrific.
As far as I can find out they do not have any particular designation but people seem to know them as "PCB Pickups".
There sure are some knowlegable people around!