
It is important to note that there are several versions of the gold foil. One has the large screw pole pieces running along the center with a chrome surround. Another type has smaller pole piece screws and a chrome surround with four fixing screws somewhat like a Rickenbacker toaster or a DeArmond. The magnets in these two types as explained by Jason Lollar, renowned pickup designer, are actually magnetized rubber. A third type has small pole piece screws along the edge and are the type used by Ry Cooder. These are pictured at the top of this post on a Teisco SS4L. The third type is considered by many to be the best sounding of the three with a slightly higher output, roughly 5.6k ohms, and alnico magnets in the pole pieces.
As the gold foil phenomenon grows these pickups are becoming more valuable. Whether you are a collector or just a lover of slide guitar or blues in general, check out the gold foils. You won't be sorry you did!