"JavierM" wrote in message
oups.com...
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.


Sounds like you are picking up some external interference (Rega 300
likes Radio Moscow, apparently) - move the turntable and amp somewhere
different to check. and move the wires about. Also check there aren't
any transit screws that need loosening, although I don't think this is
the problem here.