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Hi,
Someone on the Seymour Duncan pickup forum suggested I'd find knowledgeable people here.
I'm trying to find information on a vintage pickup that was purchased in the UK in the mid to late 1940s (at a best guess) and was on my dad's Gibson Cromwell.
It has two pole pieces, is 3.8k ohms resistance, and the dimensions are roughly 82mm x 46mm x 10mm (very roughly 3 1/4 x 2 7/16 x 13/32).
If you tilt it to the light you can clearly see the outlines of the two coils, and the construction seems to be two oval pole pieces screwed to a flat ferrous base, coils around the pole pieces, with a case fitting over everything. The top really is moulded to the coils and I wonder if the case is a hollow rectangle making the sides into which the coils were inserted and potted, and then the textured finish was applied. It's hard to tell what the case is made of under the textured finish, but as the terminals are screwed to the case, either the textured finish originally provided insulation for the terminals or the case is in bakelite or something similar (I suspect the latter). I'll see if I can get a careful "poke" at some exposed material in the screw holes. The base shows clear traces of attempts to connect an earth/ground.
There are no markings, text or numbers of any description.
Given the difficulty getting a clean resistance I suspect that either the terminals are no longer insulated from the case or that insulation on the windings has broken down.
Can anyone help identify it or point me in the right direction?
Thanks in advance for any help
nick
Someone on the Seymour Duncan pickup forum suggested I'd find knowledgeable people here.
I'm trying to find information on a vintage pickup that was purchased in the UK in the mid to late 1940s (at a best guess) and was on my dad's Gibson Cromwell.
It has two pole pieces, is 3.8k ohms resistance, and the dimensions are roughly 82mm x 46mm x 10mm (very roughly 3 1/4 x 2 7/16 x 13/32).
If you tilt it to the light you can clearly see the outlines of the two coils, and the construction seems to be two oval pole pieces screwed to a flat ferrous base, coils around the pole pieces, with a case fitting over everything. The top really is moulded to the coils and I wonder if the case is a hollow rectangle making the sides into which the coils were inserted and potted, and then the textured finish was applied. It's hard to tell what the case is made of under the textured finish, but as the terminals are screwed to the case, either the textured finish originally provided insulation for the terminals or the case is in bakelite or something similar (I suspect the latter). I'll see if I can get a careful "poke" at some exposed material in the screw holes. The base shows clear traces of attempts to connect an earth/ground.
There are no markings, text or numbers of any description.
Given the difficulty getting a clean resistance I suspect that either the terminals are no longer insulated from the case or that insulation on the windings has broken down.
Can anyone help identify it or point me in the right direction?
Thanks in advance for any help
nick