The Model 41 is designed to create broadcast standard IFB outputs from line-level audio sources.

The Model 47A Interfaces two-wire full-duplex party-line (PL) intercom circuits with four-wire audio circuits associated with matrix intercom systems.

The Model 34 Talent Amplifier is a self-contained listen-only "beltpack" unit that drives talent earpieces or headsets.

The Model 72 Level Meter Interface is a compact, portable device that plugs directly into an IFB or intercom circuit and provides two useful functions: audio level meters and line-level audio outpu