SUT not working

My step up is playing silly buggers, it is much quieter on the left channel than the right. Switching out with another is good so I know it’s not phono stage issue.

How can I measure and check a SUT?

input on both L&R is measuring 1.2 Ohms + to -
output on both L&R is measuring 277 Ohms + to -

Have you tried turning it off and then on again?


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Replace the leads to eliminate that first, mine had similar issues and it turned out to be. Leads