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Romy the Cat wrote:

I think I need to put a switch that would disconnect the right and left primary in case the Mono SPU is used. I ‘m still thinking about a more elegant solution….

Well, it is resoled and it is resoled remarkably simple and effective. Now both stereo and mono cartridges with max out gain of my playback have noise of a CD player. Furthermore the geometry of the cables became to be irrelevant for ground loops. A magic solution? You bet, at least in my case.

I spoke today with Dima and he noted that what I am complaining about should not take please. As one of the possible solution he proposed to decouple the grounding of the transformer primary from ground with a pair of small 50R-100R resistor. I did exactly that: I removed the direct short and I put instead 100R resistor on each channel from ET2’s primary to ground.  It works like a champ. Dima, spent a long time explain to me why it will be immaterial for stereo and work one in mono… and it works!!!

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