The
Amplifier and Loudspeaker Unit 16A, sales name Melody, is a line powered add-on unit
providing hands-free, voice-switched loudspeaking telephone facilities.The case of the Amplifier and Loudspeaker 16A is designed in the same style as the Ambassador telephone and is available in dark Brown or mid-Grey.
The unit has three controls on the face plate:-
1. The on-off switch is used to connect the unit to line
2. The mute switch disconnects the internal microphone.
3. The slide switch adjusts the loudspeaker volume.
Switches 1 and 2 have a locking action and associated LED's that show when the switches are operated.