I just acquired a 50's 55S and a 556 which have 1/4" plugs for connecting. I would like to rewire for XLR connections. Can you help me with this?
Depending on the year of 55S that you have, it will have either a 3 pin XLR connector or a 3 pin screw-on Amphenol connector. These are both wired the same way.
Pin 1 - Ground
Pin 2 - Audio +
Pin 3 - Audio -
The 556 came with a permenantly attached cable. To wire this for an XLR, connect the wire as follows:
Shield - Pin 1
Black - Pin 2
White - Pin 3