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Why my SUT hums only with certain phonostages ?

Hi,
I use a vintage Ortofon STM-72 SUT with my Lyra cartridge. Curiously, when I connect it via my solid state RCM Sensor prelude phonostage, there is a strong hum. The hum lowers when I connect the earth lead of the phono cable to the phonostage earthing point, but still there is a hum which is distracting. However when I connect the SUT to my Shindo Aurieges MM phono stage there is absolutely no hum. I dont even have to connect the earth lead. What is the reason ? Is it my SUT or my phonostage ?
pani

Showing 1 response by jfrech

jfrech's avatar
jfrech
1,816 posts
 
Pani I get a low level hum from my ear mc4 into the mm input on my nagra vps...with allaerts mc 2 finish. It's a low out put .2mv....

When I use my lyra atlas...same sut and phono no hum...but I also don't need so much gain...so I suspect the phono has a noise floor that the allaerts exposes...

I do prefer the sut vs the mc input on the nagra

I've tried all sorts of grounding....wish I could directly answer your question
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