Hi all,
Here is my latest issue.... I got a rather unkempt Sony DVP-S9000ES DVD/SACD player and it works rather nice for having rusted a bit in the back BUT.... I noticed that it is humming rather loudly :/
Now one day I turned on my system and I noticed a humming sound and as I increased the volume at reference level and it progressively it got worse with the increase in volume. It is very distracting and you can clearly hear it :/
Ok here is the short story:
- when the Sony is not PLUGGED in the power cord, the reciever input makes a very small humm that is not really detectable at 0db but it is there. I'll attribute that to the receiver and all other crap that is plugged in.
- as soon as the Sony gets Plugged in (not powered, just plugged in) the hum gets louder at that input ( i think also several other inputs increased in humm as well)
- than i plug in the interconnects and.... supper annoying hum and buzzing at 0db and at +20b it is just crazy.
- I was testing for the humming with my headphones so i wont damage my speakers.
Mind you that the thing isn't even powered up so it immediately is pointing towards an Earth loop. The earth wire on the Sony connects to the chassis and guess what... when you buzz out the RCA output shield or any ground circuit ground connection, it connect to the chassis earth.
I had the idea that the RCA interconnects are touching the chassis/backpanel and are creating a loop trough there and shorting the earth ground trough the RCA interconnects feeding the hum. I tried isolating the back panel from the RCA interconnects but that didn't help :/
Than I disconnected the earth wire from the IEC socket to the chassis and naturally the whole system became DEAD QUIET! better than my SACD input even :/
I am really temped to leave it disconnected BUT that isn't particularly safe now is it?
I am thinking to isolate ALL circuit boards from the chassis but that will be a major pain and it might not fix the issue since it all leads to earth ground at one point.
Any suggestion guys?
Here is my latest issue.... I got a rather unkempt Sony DVP-S9000ES DVD/SACD player and it works rather nice for having rusted a bit in the back BUT.... I noticed that it is humming rather loudly :/
Now one day I turned on my system and I noticed a humming sound and as I increased the volume at reference level and it progressively it got worse with the increase in volume. It is very distracting and you can clearly hear it :/
Ok here is the short story:
- when the Sony is not PLUGGED in the power cord, the reciever input makes a very small humm that is not really detectable at 0db but it is there. I'll attribute that to the receiver and all other crap that is plugged in.
- as soon as the Sony gets Plugged in (not powered, just plugged in) the hum gets louder at that input ( i think also several other inputs increased in humm as well)
- than i plug in the interconnects and.... supper annoying hum and buzzing at 0db and at +20b it is just crazy.
- I was testing for the humming with my headphones so i wont damage my speakers.
Mind you that the thing isn't even powered up so it immediately is pointing towards an Earth loop. The earth wire on the Sony connects to the chassis and guess what... when you buzz out the RCA output shield or any ground circuit ground connection, it connect to the chassis earth.
I had the idea that the RCA interconnects are touching the chassis/backpanel and are creating a loop trough there and shorting the earth ground trough the RCA interconnects feeding the hum. I tried isolating the back panel from the RCA interconnects but that didn't help :/
Than I disconnected the earth wire from the IEC socket to the chassis and naturally the whole system became DEAD QUIET! better than my SACD input even :/
I am really temped to leave it disconnected BUT that isn't particularly safe now is it?
I am thinking to isolate ALL circuit boards from the chassis but that will be a major pain and it might not fix the issue since it all leads to earth ground at one point.
Any suggestion guys?