Pickup connector
The pickup plug is the male connector for connecting an external sound source such as a record player , Tefifon or Trautonium to the pickup input socket or input coupling of an amplifier or a radio receiver . The two-pole connector, like the loudspeaker connector, has similar dimensions to the Euro connector with 2 × 4 mm pin diameter and 19 mm pole spacing.
With the spread of stereophony , a third contact was required for two-channel stereo transmission and this was implemented as a center pin with a rectangular cross-section of 2 × 7 mm.
This standard, which is not protected against polarity reversal, has been replaced by the round three- and five-pole plug connectors for the diode connection , described in the standard for DIN plug connectors DIN 41524.
Occupancy
With a two-pole connector, the signal is on one contact and the ground on the other. When using coaxial cables , this is the braid of the shield .
With the three-pin connector for single-channel mono transmission , the center contact is either free and can be removed if necessary or connected to ground, as is the case with most input sockets of monophonic tube receivers . With stereo transmission, the signals for the two channels are on the external contacts and the center contact serves as a common ground.
A colored dot or mark on the connector is used to distinguish between signal and ground or the two stereo channels. The poles of the device socket are labeled with text or symbols.