JavierM wrote:
On 11 nov, 11:19, Eiron wrote:
JavierM wrote:
On 11 nov, 00:32, "Serge Auckland"
wrote:
"JavierM" wrote in message
oups.com... Hello, I bought a new Denon DP300F turnatble and I was a bit
disappointed and worried as it came without a ground wire. I plugged
the turntable to my Denon amplifier, at the phono input and there is a
small noise, something like a small zuuuuummmmmm
How can I solve this? Can I put myself a ground wire, from some inside
parto of the player? A little help would be appreciated, sorry for my
errors, I'mnot english.
Firstly, the DP300F includes its own RIAA preamp, so if you are plugging it
into the amplifier's phono input, you can expect a lot more noise and high
distortion as well as a very unbalanced frequency response. You MUST use one
of your amplifier's high-level (line) inputs.
Assuming you are using a high-level input, then first check that a ground
wire is necessary. Take a piece of wire and connect one end to the ground
point of your amplifier. Then, remove the insulation from a few millimetres
of the other end and touch this to the pickup arm. If the hum stops, then a
ground wire is the answer. If the hum doesn't change or even gets worse,
then you have other problems.
If you have proved that the ground wire works, then look under the turntable
plinth and attach the ground wire to a metal point on the pick-up arm base.
The wires coming through the arm may have a convenient ground tag, or you
may have to unscrew a mounting bolt and wrap the wire under it. Make sure
that the ground wire does not interfere with the free movement of the arm.
Good luck
S.
--http://audiopages.googlepages.com
Thanks for your help, i'll try all that you say. The DP300 comes with
an preamp, indeed, but it can be turned "off" or "on" with a switch.
When I plug it into the amplifier's phono input, I turn it off. But
i've tryed to plug it into the AUX input, activating the RIAA preamp
and the buzzzzzz is exactly the same.
One curiosity: when I approach my hand to the back zone where the RCA
wires are out of the turnatble, the buzzzzzz increases a little.
You probably need to add an earth to your amplifier.
It sounds as if everything is double insulated and nothing is earthed.
If the amp has a ground screw, add a wire from that to the earth pin
on the mains plug. If not, try loosening a chassis screw and fix a wire
to that.

--
Eiron.- Ocultar texto de la cita -

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Yes the amp has a groud screw, I'll try to attach a wire from that
point to somewhere on the turntable. Thanks

No, try connecting the amp's ground screw to an earth first before
attaching anything to the turntable. An audio system should have one
earthed component, unless you have balanced interconnects.

--
Eiron.