ENS abbreviation - Signat RAP 1

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Morning, lads.


So I just finished power supply repair and recap on a Signat Rap 1. I noticed there are four small pots labeled ENS, one for each input channel.

I found no explanation for this letter combination. Before fiddling with the pots or start reverse engineering I thought I'd ask around.


Does someone have any experience with these?


Thanks!
 
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