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The pitfalls of avoiding Ground Loops...
The pitfalls of avoiding Ground Loops...
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Old 15th August 2018, 07:24 PM   #11
EssB is offline EssB  United Kingdom
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I can't quite read it but is there a class designation in the printed label at lower right centre of back panel? looks like it may say 'Class ?' but my eyes could be playing tricks on me.

OK post x-over you've just answered it.
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Old 15th August 2018, 07:26 PM   #12
MarcelvdG is offline MarcelvdG  Netherlands
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That makes me wonder why Sony didn't make it double insulated, like they do with almost all of their other equipment. With normal signal ground connections, safety earth on unbalanced equipment only causes ground loops anyway.
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Old 15th August 2018, 07:56 PM   #13
Preamp is offline Preamp  Germany
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Originally Posted by EssB View Post
I can't quite read it but is there a class designation in the printed label at lower right centre of back panel? looks like it may say 'Class ?' but my eyes could be playing tricks on me.
It says "Class B Digital Apparatus". FCC stuff.

Even the service manual shows a three-prong power connector and has a part number for the screw to connect the earth wire to the case. Not sure why there's not even a third wire soldered to the connector in my unit. Anyhow, I added one and now the problem is fixed. No more AC between the RCA connectors and no more hiccups when switching sources.

Well thank you then, Sony . Dog Eat Dog were right: "when you least expect it, expect the unexpected"...



Now on to enjoy some music . Thank you guys for pointing me in the right direction!
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Old 3rd September 2018, 09:02 AM   #14
rmaudio is offline rmaudio  United Kingdom
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Originally Posted by Preamp View Post
I'm unable to measure any resistance there due to the prevalent voltage.
I meant measuring it with the equipment turned OFF
But you seem to have resolved the issue anyway.
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