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Rolla field coil speaker?
#3

Sounds like the "hum bucking" winding used on most radios of the 1930s. It was phased with the voice coil winding to remove any residual hum caused by the field winding.

Harv


Messages In This Thread
Rolla field coil speaker? - by Guest - 08-10-2009, 08:40 PM
Re: Rolla field coil speaker? - by Guest - 08-10-2009, 10:17 PM
Re: Rolla field coil speaker? - by mandh - 08-11-2009, 05:41 PM



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