Aleph L output volume control

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I find in my aleph L 10k elna stepped attenuator at otputs, looks like those in X2 or P.Should it be something like 750 or 1000 Ohms.In Owners's manual says Output Impendance 0-750 ohms.
This is the one of first revisions of L ser. num. is 5674, and none service manual on passlabs site match my preamp.
Thanks for any answer.
 
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