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hum with balanced connection

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I have a question about the L3 line amp
i have the Signature with balanced c core
and play only with the rca output yesterday i was trying the balanced output
i opened the L3 and i solder a wire on the rca ground (yellow cable from transformer ) and connect it to the pin 1 on the balanced connector
then solder a wire to the rca hot (orange cable from the transformer) and connect this to the pin 2 of the balanced connector
I connect the bleu wire from the transformer to the middel pin 3 of the balanced connector , like shown on the manual.
is this the right way ???
And can i solder all the connectors together ? or just the ones i use?
There was no rca cable plugged in when i try the amp.


When i put on the amps i hear music but much louder than the RCA connector and a loud hum trough the music.....
i hope someone can help me with this
best regards Robert

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