07-29-2014, 01:20 PM
LIke Morzh said, a hum-bucking winding in an EM speaker is in series with the voice coil, so if it's disconnected - no sound from speaker.
However, it can be wired two ways, obviously. The connection one way will decrease the residual hum and the other will increase it.
In or out of phase with the field coil.
Chuck
However, it can be wired two ways, obviously. The connection one way will decrease the residual hum and the other will increase it.
In or out of phase with the field coil.
Chuck
Chuck Schwark,
The Philco Repair Bench
[Image: http://www.philcorepairbench.com/images/philog3tiny.gif]
http://www.philcorepairbench.com
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
