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The LED should not be connected in the way shown - it is fed only from XLR pin 3 and one 6K8 resistor, unbalancing the line.

Also when the left hand switch is operated (to mute the audio?) XLR pins 2 + 3 are shorted - so the LED will  glow brighter, as it is now fed from both 6K8 resistors.

Can you clarify what the terminals 2 - 6 connect to?  (A transformer perhaps?).


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