1/4 Inch Jack Plugs M Series. A comprehensive offering of inch jack plugs from Amphenol M series (Musician Range) of high-quality connectors in mono or stereo versions. Right angle or straight in satin nickel, or black finish ideal for all applications that call for a inch phono plug, including microphones, musical instruments and many others. All models are highly reliable and excellent quality. Features ; Benefits. Standard or gold plated finish 90 degrees or straight versions