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Ok, so i have had my WetMag IV from new, and always presumed it was a 16Quin.... however looking at certain paperwork and vintage ads they were initially listed as a 16Quad.

Mine was opened up for the first time this week, for a rebuild, and it turns out to be a 16Quad. Quite surprised.

Does anybody know when the spec changed??

So if the vintage ads are correct, and yours is a 16x4, where is the discrepancy?