• 15 watts
• Two way conversation between telephone and loudspeakers
• Hands-free talkback from speakers
• Signal-activated music muting circuit 

Overview:

The TBA-15 talkback amplifier automatically senses and switches the direction of conversation between a telephone and remote loudspeakers. Control of speech direction is maintained at the telephone. Screwdriver-adjustable controls are provided to adjust switching sensitivity, switching delay time and loudspeaker and handset volume. The amplifier includes a 600 ohm transformer-coupled telephone line input, 25V/70V constant-voltage outputs and mute terminals to facilitate unidirectional paging. The amplifier is easily installed on a backboard or in standard 19” equipment rack.

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