"lordy" wrote in message
...
On 2006-08-29, Trevor Wilson wrote:

"lordy" wrote in message
...
On 2006-08-29, Trevor Wilson wrote:

"Trevor Wilson" wrote in message
...

**OK, first mistake: The Debut is already fitted with a phono preamp.
It
can only be used with a line level input.

**Oh yeah. Make certain the MC/MM switch is correctly set.

Hi Trevor, after a bit of Googling, it looks like you have the "Phono
Speedbox"
edition ??

**I don't own one, I just fix 'em. All of the Debuts I see are fitted
with
an internal phono preamp.

Do they have speed controls too?

**No idea. I only test TTs at 33.33RPM, unless specifically directed to do
otherwise. I DID, however, fall into the trap of testing the Debut into a
phono preamp. Once. Are you absolutely certain yours does not have a
built-in phono preamp?


Anyhow it looks like there are different flavours from that web page.

I did a bit of experimenting, I removed the belt,
the noise only occurs when the motor is on and the needle is either
in the groove, or outside the groove and not moving tangentially/skating.

I then took a record I didnt care much for, put the stylus on it, and
lifted the record clear of the turntable. I still had the noise,
so I guess as you say its electrical problem and not mechanical.

Over in avforums some other people have mentioned this hum, but no
indepth feedback yet!

**Are you using the correct power supply?


--
Trevor Wilson
www.rageaudio.com.au



--
Posted via a free Usenet account from http://www.teranews.com

"lordy" wrote


I did a bit of experimenting, I removed the belt,
the noise only occurs when the motor is on and the needle is either
in the groove, or outside the groove and not moving tangentially/skating.



Presumably you have removed the transit screws from the motor.....????

On 2006-08-29, Trevor Wilson wrote:

Are you absolutely certain yours does not have a
built-in phono preamp?

Pretty much. IIRC a phone preamy boosts the signal quite a few times and
does some bass-eq. Would this be clearly audible from my mp3 snippets?
The manual is in the loft but it sounds just fine when plugged into my
amps phono sockets. (Apart from the hum which I'll be double checking
downstairs before deciding if this deck goes back to Richer Sounds,)


**Are you using the correct power supply?

Yup. The one that came with it. 16v-500ma


--
Trevor Wilson
www.rageaudio.com.au

On 2006-08-29, Keith G wrote:

"lordy" wrote


I did a bit of experimenting, I removed the belt,
the noise only occurs when the motor is on and the needle is either
in the groove, or outside the groove and not moving tangentially/skating.



Presumably you have removed the transit screws from the motor.....????

Yup. Forgot to mention that. Yup. These have already been removed and
the motor is hanging freely on its elastic bands.

Its either electrical or somehow vibration is travelling through the
tonearm, as it was still audible when the record was lifted clear of the
platter.

Lordy

On 2006-08-29, lordy wrote:
On 2006-08-29, Trevor Wilson wrote:

Are you absolutely certain yours does not have a
built-in phono preamp?

Pretty much. IIRC a phone preamy boosts the signal quite a few times and
does some bass-eq. Would this be clearly audible from my mp3 snippets?

Just checked without preamp. Very quite despite maximum gain on the sound card,
and little bass.

Lordy

On 2006-08-29, lordy wrote:
On 2006-08-29, Keith G wrote:

"lordy" wrote


I did a bit of experimenting, I removed the belt,
the noise only occurs when the motor is on and the needle is either
in the groove, or outside the groove and not moving tangentially/skating.



Presumably you have removed the transit screws from the motor.....????

Yup. Forgot to mention that. Yup. These have already been removed and
the motor is hanging freely on its elastic bands.

Its either electrical or somehow vibration is travelling through the
tonearm, as it was still audible when the record was lifted clear of the
platter.

Lordy

Hmmm,

Apart from two other chaps mentioning hum on avforums (One who may not
have earthed properly). It looks like this could be something more
widespread..

See customer comment here..
http://store.acousticsounds.com/brow...tion=equipment

But this could be a red herring on my part...

Lordy

"lordy"
Phil Allison


The background noise is only present when the stylus hits the vinyl - so
I guess its not a ground issue? Does it sound excessive?


** There should be NO audible noise attributable to a hi-fi turntable
itself.


My first & last reply to you.


** But not mine to you - you asinine ****wit.


I'm actually trying to find out if I have
faulty or badly set up equipment. I'm not trying to dis' vinyl or
anything like that.


** What I wrote above suggested no such thing.



YOUR absolutely asinine 5 minute MP3 demonstrates nothing at all -
except the fact that vinyl is noisy.

I can hear the same 50Hz component on all the records I've tried , but
oddly enough only
when the needle drops right into the groove. When its skating just prior
to dropping in the groove no noise.


** You left out that CRUCIAL remark re 50Hz from your FIRST post and
instead used the completely ambiguous " background noise " phrase.

That stupid MP3 file you posted was chock full of **crackling noise **.


BTW - ****head.

There is no need to have a turntable itself rotating to hear vibration
induced hum from the motor - just slip off the belt and rest the stylus on
a stationery disk OR on a suitable object placed on the base .

If 50 / 100 Hz hum is plainly audible - the turntable is not hi-fi.




........ Phil

"lordy" wrote in message
...
On 2006-08-29, lordy wrote:
On 2006-08-29, Keith G wrote:

"lordy" wrote


I did a bit of experimenting, I removed the belt,
the noise only occurs when the motor is on and the needle is either
in the groove, or outside the groove and not moving
tangentially/skating.



Presumably you have removed the transit screws from the motor.....????

Yup. Forgot to mention that. Yup. These have already been removed and
the motor is hanging freely on its elastic bands.

Its either electrical or somehow vibration is travelling through the
tonearm, as it was still audible when the record was lifted clear of the
platter.

Lordy

Hmmm,

Apart from two other chaps mentioning hum on avforums (One who may not
have earthed properly). It looks like this could be something more
widespread..

See customer comment here..
http://store.acousticsounds.com/brow...tion=equipment

But this could be a red herring on my part...

Lordy

Could be a bit of hum and rumble mixed in together. No I haven't bothered
placing your samples into CEP and analysing them - too busy today for that.
Some records actually have some rumble evident from the master cutting
process. :-(

To eliminate the 50Hz hum from the equation, set the turntable platter in
motion and lower the cartridge so that the stylus is just clearing the
record surface. Move the tonearm from the outer edge of the record towards
the label area. If there is any hum induction taking place it will be
clearly heard without the possibility of rumble pickup and record surface
noise masking the induced hum. Then experiment with potential earth loop
problems.

Worth a try. What have you got to lose?

Cheers,
Alan

On Mon, 28 Aug 2006 23:51:19 GMT, lordy wrote:

On 2006-08-28, Eiron wrote:
lordy wrote:

You have 6.5Hz, 50Hz and 100Hz components. Check your earthing for a start
and try to keep vibrations away.

Thanks.

. I've re-recorded the clip and I've noticed something more interesting about
that noise. It only kicks in when the groove is found...

http://lordy.org.uk/noise.html


No, the hum at least is there all the way through - it is just audibly
masked during the really noisy bit while finding the groove.
The Maplin preamp is showing signs of distress at the start when it is
trying to come out of the massive overload - it is very slow regaining
its proper internal bias state. If you are archiving a load of discs,
then probably some of them will be in better condition than this one
and would benefit from a better phono pre-amp.

Standing the turntable on something more solid may help you with some
of that extraneous mechanical noise, but I would really not hope for
anything very much better than you have (apart from the hum, that has
to go). Most of that other stuff is simply what vinyl does, I'm
afraid. Do use a steep high pass filter at about 20Hz on your
recording, though - it would be unkind to your speakers otherwise.

d

--
Pearce Consulting
http://www.pearce.uk.com

On Tue, 29 Aug 2006 11:34:35 +1000, "Trevor Wilson"
wrote:


**No idea. I only test TTs at 33.33RPM, unless specifically directed to do
otherwise. I DID, however, fall into the trap of testing the Debut into a
phono preamp. Once. Are you absolutely certain yours does not have a
built-in phono preamp?

Trevor, listening to his clips it is very clear that they haven't been
de-emphasised twice, so there is only one phono pre-amp in the chain.

d

--
Pearce Consulting
http://www.pearce.uk.com