LDR Pre MkII - LDR volume control and I/O switching

I tested my system. My ldr pre is built into same chassis with RMI-FC100. I hear very faint transformer buzzing when I press my ear against the mid bass driver, but it’s the same on all volume positions, including 50 (max). I don’t even have ps grounded to chassis. I think that what I hear is coming from amp PS, as I don’t really use audio transformers. I will test more.
 
I found some time and installed the preamplifier in the chassis.
 

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