In article , Java Jive
wrote:
On Tue, 20 Dec 2011 09:30:38 +0000 (GMT), Jim Lesurf
wrote:


'Bias' force can be quite tricky to set 'right'. You may find that the
force that actually gives optimum tracking when playing *will* cause
groove jumping when the stylus hits a large scratch or obstruction.
IIRC many years ago it was shown by various people that a 'neutral'
'bias' (as produced by using a blank LP and adjusting for no drift)
was far from giving the best playing.

Could well be. I suspect bias is the probably explanation of why the
recordings have a DC offset,

I think that is very unlikely. Both the cartridge and most RIAA amp designs
I've seen don't pass or sense 'DC'. MM and MC cartridges in particular are
*velocity* sensors.


I did encounter distortion on a few albums. Curiously, the one that was
worst sounded even worse on the Project - I can't work that particular
point out at all.

Can be due to differences of carious kinds.

Generally however, at first I thought this was due to
tracking again, but I've since come to the conclusion that it's the
stiffness of the new wiring working in a vertical direction to reduce
the stylus pressure from that nominally set - it used to be set to 1g,
but now it has to be 3g, and some albums still distort.

That does seem like something seriously wrong.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

Java Jive wrote:
Yes. Underneath the deck, there is no convenient point of attachment
for the cable directly on the arm's vertical axis of horizontal swing,
which would be the preferred place for it to reduce it's

FAIL.

"Jim Lesurf" wrote in message ...

snipperty doo doh

I think that is very unlikely. Both the cartridge and most RIAA amp
designs
I've seen don't pass or sense 'DC'. MM and MC cartridges in particular are
*velocity* sensors.

Hey Jim, you really do talk ********...

"FUL" wrote in message
...


"Jim Lesurf" wrote in message ...

snipperty doo doh

I think that is very unlikely. Both the cartridge and most RIAA amp
designs
I've seen don't pass or sense 'DC'. MM and MC cartridges in particular
are
*velocity* sensors.

Hey Jim, you really do talk ********...


So which universe do you come from then "FUL"? because in this one what Jim
said is entirely correct.

David.

At 10:39:42 Wed, 21 Dec 2011, Jim Lesurf wrote
in article :
In article , Java Jive
wrote:
On Tue, 20 Dec 2011 09:30:38 +0000 (GMT), Jim Lesurf
wrote:


'Bias' force can be quite tricky to set 'right'. You may find that the
force that actually gives optimum tracking when playing *will* cause
groove jumping when the stylus hits a large scratch or obstruction.
IIRC many years ago it was shown by various people that a 'neutral'
'bias' (as produced by using a blank LP and adjusting for no drift)
was far from giving the best playing.

Could well be. I suspect bias is the probably explanation of why the
recordings have a DC offset,

I think that is very unlikely. Both the cartridge and most RIAA amp designs
I've seen don't pass or sense 'DC'. MM and MC cartridges in particular are
*velocity* sensors.

Quite apart from the fact a sound card will have decoupling capacitors
in the input circuitry - as I found out not so long ago when I converted
a couple of mine to work as DC ADCs.

--
John Legon

"FUL" wrote in message
...


"Jim Lesurf" wrote in message ...

snipperty doo doh

I think that is very unlikely. Both the cartridge and most RIAA amp
designs
I've seen don't pass or sense 'DC'. MM and MC cartridges in particular
are
*velocity* sensors.

Hey Jim, you really do talk ********...

No, Jim said something that is completely and totally true.

Not only is the LP format inherently incompetent for DC signals, it is in
pretty dire circumstances while trying to accurately reproduce low frequency
AC, which is to say anything below about 100 Hz.

If there's ******** being spewed here, its what you are doing right now.
Grow up!

On 12/22/2011 01:03 PM, Arny Krueger wrote:
wrote in message
...


"Jim Lesurf" wrote in message ...

snipperty doo doh

I think that is very unlikely. Both the cartridge and most RIAA amp
designs
I've seen don't pass or sense 'DC'. MM and MC cartridges in particular
are
*velocity* sensors.

Hey Jim, you really do talk ********...

No, Jim said something that is completely and totally true.

Not only is the LP format inherently incompetent for DC signals, it is in
pretty dire circumstances while trying to accurately reproduce low frequency
AC, which is to say anything below about 100 Hz.


Well I wonder where I got the idea that they can accurately reproduce
low frequency down to 50 hz. All these years I must have been mistaken.
Thanks for sorting that one out Arny. [1]
1. sarcasm intended.

In article , Arny
Krueger
wrote:

"FUL" wrote in message
...


"Jim Lesurf" wrote in message ...

snipperty doo doh

I think that is very unlikely. Both the cartridge and most RIAA amp
designs I've seen don't pass or sense 'DC'. MM and MC cartridges in
particular are *velocity* sensors.

Hey Jim, you really do talk ********...

No, Jim said something that is completely and totally true.

Not only is the LP format inherently incompetent for DC signals,

If nothing else, I'd be alarmed by the DC offset that would be caused
simply by lowering the stylus into the groove. The vertical displacement of
the stylus that causes is quite visible! Hate to think how much it would
move the speaker cones if the entire system was dc coupled! :-)

it is in pretty dire circumstances while trying to accurately reproduce
low frequency AC, which is to say anything below about 100 Hz.

FWIW http://www.audiomisc.co.uk/HFN/LP1/KeepInContact.html
might illuminate that a little if people consider the implications of, say,
Figures 5 and 8.

Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

"recursor" wrote in message
...
On 12/22/2011 01:03 PM, Arny Krueger wrote:
wrote in message
...


"Jim Lesurf" wrote in message ...

snipperty doo doh

I think that is very unlikely. Both the cartridge and most RIAA amp
designs
I've seen don't pass or sense 'DC'. MM and MC cartridges in
particular
are
*velocity* sensors.

Hey Jim, you really do talk ********...

No, Jim said something that is completely and totally true.

Not only is the LP format inherently incompetent for DC signals, it is in
pretty dire circumstances while trying to accurately reproduce low
frequency
AC, which is to say anything below about 100 Hz.

Well I wonder where I got the idea that they can accurately reproduce low
frequency down to 50 hz.

I suspect that has something to do with one or more of the following:

(1) Not doing really well-controlled listening comparisons.

(2) Not doing technical measurements and referencing the results to what is
known about audiblity.

All these years I must have been mistaken.

More likely, you believed what you were told way back when.

Thanks for sorting that one out Arny. [1]
1. sarcasm intended.

None sensed. ;-)

"Jim Lesurf" wrote in message
...
In article , Arny
Krueger
wrote:

"FUL" wrote in message
...


"Jim Lesurf" wrote in message ...

snipperty doo doh

I think that is very unlikely. Both the cartridge and most RIAA amp
designs I've seen don't pass or sense 'DC'. MM and MC cartridges in
particular are *velocity* sensors.

Hey Jim, you really do talk ********...

No, Jim said something that is completely and totally true.

Not only is the LP format inherently incompetent for DC signals,

If nothing else, I'd be alarmed by the DC offset that would be caused
simply by lowering the stylus into the groove. The vertical displacement
of
the stylus that causes is quite visible! Hate to think how much it would
move the speaker cones if the entire system was dc coupled! :-)

it is in pretty dire circumstances while trying to accurately reproduce
low frequency AC, which is to say anything below about 100 Hz.

FWIW http://www.audiomisc.co.uk/HFN/LP1/KeepInContact.html
might illuminate that a little if people consider the implications of,
say,
Figures 5 and 8.

Great examples!

What also needs to be said is that LPs with signals 0 dB are not uncommon.

Figure 6 shows that records cut with your reference level are precariously
close to simply popping the needle out of the groove in the vertical
direction.