Connectors Used In The Broadcast Industry Past And Present
Post Office Jack Originally used by the British Post Office (PO), these 1/4" Jack lookalikes were once widely used in the broadcast industry. In spite of their similar appearance, PO316 jacks or B-gauge jacks, as they are known, are not compatible with 1/4" mono and stereo jacks due to the smaller tip. The PO316 jack was once the most common audio connector. It has three contacts, the tip, ring and sleeve, which provided the connections for a balanced audio circuit with a screen....