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Hi Ulysses and Tim
I think what Tim was getting at is that the transformer ensures the output is balanced. Without it if you had only unbalanced sources, while the output is strictly 'balanced' there would be no great contribution from the 'opposite' phase being thus the same as an unbalanced output.
It would still of course 'contribute' to hum and interference cancellation which would be lost if the transformer were omitted and it is fed into an unbalanced stage.
Matt S
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