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Old 28th May 2020, 12:44 pm   #5
dagskarlsen
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Join Date: Jan 2008
Location: Hakadal, Norway
Posts: 640
Default Re: GPO Jack unit 1B and regulator 6B

Quote:
Originally Posted by 198 kHz View Post
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.
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
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