Quote:
Originally Posted by Gridiron
....How was it connected to the set, was it permanently wired or was there a plug/socket arrangement?...
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This unit would have been permanently wired to the set by a technician, often with the speaker isolating unit (to give it a more correct name) fitted to the rear of the television set with a couple of screws through the back.
The switch is wired in series with the "hot" side of the television sound output stage and internal speaker positive the connection to allow the internal television speaker to be muted, the third lead being common ground/speaker negative.
The isolating transformer then allows an external speaker or tape recorder/amplifier to be safely connected.
I only ever seem to recall seeing one of these units in use back in my "rental' television repair days on either a BRC 3500 or a TX9 chassis, I can't remember which.....
Andrew