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A stereo cartridge is designed to respond to both lateral and vertical modulation. If you play an Edison DD or other vertical modulation recording with a stereo cartridge and listen thru a full stereo playback system, you will hear the recording but the sound will be out of phase between the two speakers. This will sound strange with sound coming from the two speakers but no image seeming to come from the space between the speakers. If you play a lateral mono recording such as other typical 78rpm records on this same stereo system, you will hear the recording and the sound will be in phase and sound natural from the two speakers. This may be adequate if you are only casually interested in listening to the vertical recordings.
In order to hear the sound of a vertical recording with minimum surface noise from the record, you need to combine the two signals coming from the cartridge into one signal. If you parallel- or series-connect the cartridge outputs, you will transform the cartridge into either lateral-only or vertical-only responding, depending on the particular connection. This will reduce the unwanted surface noise from the modulation direction that you don't want to hear.
Parallel connection of the cartridge outputs such that you hook the + or 'hot' connections together and the - or 'ground' connections together will result in the cartridge becoming lateral-only responding which is correct for most 78rpm records. To make the cartridge vertical-only responding, connect the 'hot' terminal of one cartridge output to the 'ground' terminal of the other channel. Similarly, connect the other two cartridge pins together. Then use only one cable (not the original two) to carry the signal from the cartridge to the amplifier. If your cartridge has only three output pins, connect one side of the output cable to one of the 'hot' pins and the other side of the cable to the other 'hot' pin and remove any cable connection from the third pin. This will allow you to play vertical modulated records such as Edison DDs and Pathé Sapphire records with minimum surface noise created by the lateral direction.