Tiny Telephone. TT connectors use miniature phone connector plugs with a 0.173″ diameter. Due to their compactness and reliability, TTs are often used for professional mixer and outboard patch bays where a single patch bay may require hundreds of patch points in a limited space. The TRS versions of TT connectors are capable of handling balanced line signals and are preferred in pro audio installations. Also called a bantam. See phone connector.