Quote:
Originally Posted by 198 kHz
It was to prevent transmitter noise on short exchange lines or PBX extensions.
The jack units in my TRS used them, as we were just across the road from the exchange.
My recollection is that there wouldn't necessarily be noise without it, but without cuent limiting by the 6B the transmitter insert in the headset could 'fry' in the long term.
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How did that regulator work? Was it just 2 resistors to make voltage and signal loss like a longer line? Never seen that, but I have seen some fried carbon transmitters.
dsk