Audio Forums


Reply
Thread Tools Display Modes

Denon DP-300F hum

 
 
Cheesehead
Guest
Posts: n/a

 
      03-03-2010, 12:31 AM
On Mar 2, 10:58=A0am, bob <nabo...@hotmail.com> wrote:
> On Mar 2, 9:13=3DA0am, Cheesehead <dplotusno...@yahoo.com> wrote:
>
> > On Mar 1, 9:50=3D3DA0pm, "Arny Krueger" <ar...@hotpop.com> wrote:
> > I guess I considered this a quality mid-range turntable rather than an
> > inexpensive unit. =3DA0It's not like it's a BSR or BIC.

>
> It's the next step up from the all-plastic $100 model with the fixed
> cartridge that tracks at 4g. Probably equivalent to the so-called
> entry-level turntables from Rega, Pro-Ject, Music Hall, etc.
>
> > By the output level being "too low" I mean that it (a) mismatches
> > other components and therefore (b) does not allow a good CD burn on my
> > Philips CD unit.

>
> But what does (a) mean, exactly? When you switch in the equalization
> and connect it to a line input on your receiver/amp, can you not get
> the volume level you want? Or is it just that you have to turn the
> volume up higher than you do for other source components? If the
> latter, that's normal.
>
> As for (b), I presume your connection is:
>
> turntable=3D3D>receiver/amp=3D3D>CD recorder
>
> ...and that you're connecting to the recorder through a Tape Out jack.
> Does your receiver/amp also have a preamp out? If so, try using that
> instead. That way, you can turn the volume up.
>
> Otherwise, you might try either a phono preamp with higher gain, or a
> booster, as Arny suggested.
>
> bob


Perhaps I misjudged the group understanding of "high-end" and should
have given more consideration to it as the highest end of audio
equipment discussions.
Over the past 30 years I've had a variety of quality components, but
only one amplifier from the highet end of the spectrum, a Mac 60.
My last speaker purchase was a pair of Wharfedale W90D speakers.
Certainly not "high end" like some Dahlquists or others of that sort,
but still quite nice, enough
that I could note the amplifier (a mere Sony) as the weak link in the
system. My current listening pleasure has been an old favorite LP
form 75: Parchment Shamblejam.

But enough of the apologetic.

My system is hooked up as you noted.
The amp unfortunately has no preamp out.
I just finished looking at the referenced pre-amps.
One of those would fit the bill quite nicely.
 
Reply With Quote
 
 
 
 
Audio Empire
Guest
Posts: n/a

 
      03-03-2010, 01:07 AM
On Tue, 2 Mar 2010 16:52:42 -0800, bob wrote
(in article <(E-Mail Removed)>):

> On Mar 2, 4:20=A0pm, Audio Empire <audio_emp...@comcast.net> wrote:
>
>> What we really need to know about before anyone can be of much help is wh=

> at
>> kind (brand and model) of phono cartridge you have. If it's a moving-magn=

> et
>> type (MM) (or moving-iron) type, then you need to use the phono input bec=

> ause
>> these cartridges are purposely rather low output compared to the other,
>> so-called, "line-level" inputs designed for CD decks, tuners, tape player=

> s,
>> etc.

>
> Perhaps you are unfamiliar with his turntable. It has a built-in
> switchable phono stage, so he does NOT necessarily have to use the
> phono input in his receiver. He gets a hum when he uses the receiver's
> phono stage, but not when he uses the table's stage. But he's
> complaining about low volume using the table's stage.
>
> bob
>


Yes, you are right, I'm not familiar with this turntable. But if it contains
it's own phono-stage and using a high-level input on his receiver/amp results
in insufficient gain, then adding another phono stage isn't going to solve
his problem (likely the phono-stage in the turntable already has RIAA EQ
applied) and, in all probability, his main problem is most likely that the
turntable's built-in phono-stage is faulty. The next problem is how to patch
around that faulty stage so that he can use the phono stage built into his
receiver/amplifier instead.

 
Reply With Quote
 
Audio Empire
Guest
Posts: n/a

 
      03-03-2010, 01:07 AM
On Tue, 2 Mar 2010 16:54:36 -0800, Cheesehead wrote
(in article <(E-Mail Removed)>):

> On Mar 2, 4:20=A0pm, Audio Empire <audio_emp...@comcast.net> wrote:
>> On Tue, 2 Mar 2010 06:13:26 -0800, Cheesehead wrote
>> (in article <7v4ko6Flc...@mid.individual.net>):
>>
>>
>>
>>> On Mar 1, 9:50=3DA0pm, "Arny Krueger" <ar...@hotpop.com> wrote:
>>>> "Cheesehead" <dplotusno...@yahoo.com> wrote in message

>>
>>>> news:(E-Mail Removed)

>>
>>>>> When I use it in equalized mode there is no hum. =3DA0But the
>>>>> output level is too low.

>
>
> [ Please trim your quotes. Excessive quotation snipped. -- dsr ]
>
>
>>> And thanks for the link. =A0Perhaps a quality pre-amp is all I really
>>> need..

>>
>> It's possible, BUT, unless you happen to have a low-output moving-coil, i=

> t's
>> probably NOT your problem. With most MM or Variable Reluctance cartridges=

> ,
>> the built-in phono stage in your receiver or amplifier should be more tha=

> n
>> sufficient. If you get plenty of output from your cartridge and sufficien=

> t
>> gain from your phono stage to give you decent volume at normal volume con=

> trol
>> settings, then the problem you have is a grounding issue and most likely =

> a
>> new phono stage would hum just as badly as the one you have now. In most
>> situations, you MUST have a grounding wire that goes from the tone-arm
>> mounting base itself to the grounding lug (usually that's a finger-screw)
>> located near the phono inputs on the back of your receiver/amplifier. Tha=

> t's
>> likely the problem with your hum. But really, I need more info before I c=

> an
>> say anything for sure.

>
> It is a MM cartridge. It is the stock unit that came with the table.
> Nothing special, but adequate.
>
> I actually picked it up unused, at a local thrift shop for an amazing
> $20.
> It replaced my Dual 505-2. Though they seemed to have similar
> performance,
> the Denon fit my location better even though the Dual's wood was much
> more attractive.
> I realize it's not a Linn or similar grade, but is still much better
> than the BICs
> that I had in the 80s.
>
> But I wonder if the equalization does not include the amplification
> that I assume it ought.


Of course it does. If it has its own built-in phono stage (someone just told
me what this particular rig actually is. I had never heard of it before), it
was designed to plug into high-level inputs on a receiver or amplifier. Since
those NEVER have RIAA EQ built in, the phono-stage in the turntable would
HAVE to contain it.

> (Or ate least ought at least by *my estimation*, anyway.)
> In that case the problem can be resolved easily with a pre-amp, as
> bob, et al, have noted.
> But that still leaves the hum issue, though it now appears avoidable.


The problem would seem to me to be one of how to eliminate the built-in phono
stage and break out a pair of phono cables (plus a ground wire) from the
bottom of the tone arm for connection to a an outboard phono stage (or the
phono input on your receiver/amplifier). If you are knowledgeable about such
things and handy with a soldering iron, you should be able to do it though.

If you feel that you still want a new outboard phono-stage, you can't beat
the Audio Technica AT-PEQ3 from David Raskin's Needle Doctor for $43. It is
really excellent.


 
Reply With Quote
 
Harry Lavo
Guest
Posts: n/a

 
      03-03-2010, 03:55 AM
"Audio Empire" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> On Tue, 2 Mar 2010 16:52:42 -0800, bob wrote
> (in article <(E-Mail Removed)>):
>
>> On Mar 2, 4:20=A0pm, Audio Empire <audio_emp...@comcast.net> wrote:
>>
>>> What we really need to know about before anyone can be of much help is
>>> wh=

>> at
>>> kind (brand and model) of phono cartridge you have. If it's a
>>> moving-magn=

>> et
>>> type (MM) (or moving-iron) type, then you need to use the phono input
>>> bec=

>> ause
>>> these cartridges are purposely rather low output compared to the other,
>>> so-called, "line-level" inputs designed for CD decks, tuners, tape
>>> player=

>> s,
>>> etc.

>>
>> Perhaps you are unfamiliar with his turntable. It has a built-in
>> switchable phono stage, so he does NOT necessarily have to use the
>> phono input in his receiver. He gets a hum when he uses the receiver's
>> phono stage, but not when he uses the table's stage. But he's
>> complaining about low volume using the table's stage.
>>
>> bob
>>

>
> Yes, you are right, I'm not familiar with this turntable. But if it
> contains
> it's own phono-stage and using a high-level input on his receiver/amp
> results
> in insufficient gain, then adding another phono stage isn't going to solve
> his problem (likely the phono-stage in the turntable already has RIAA EQ
> applied) and, in all probability, his main problem is most likely that
> the
> turntable's built-in phono-stage is faulty. The next problem is how to
> patch
> around that faulty stage so that he can use the phono stage built into his
> receiver/amplifier instead.


It may not be faulty....it is probably designed to input a computer sound
card...which in general use signals lower than traditional line level.
Doesn't change his problem, though.

 
Reply With Quote
 
 
 
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 06:51 PM.