Equaliser for Shure V15III
 

I'm trying to improve the frequency response of my V15III/SME 3009 S2, and
remember that Shure or SME had a little equaliser circuit that flattened the
response at the expense of a couple of dBs of output. Something may have
been published in HFN and/or Wireless World in the '70s, but my HFNs don't
go back that far, and I can't find it in my WWs of the era.

I've been searching on-line for the circuit all afternoon, and can't find
anything. It was simply a capacitor and a resistor or two, but I can't
remember the configuration or values.

Does anyone have this info please?

Thanks

S.


--
http://audiopages.googlepages.com

Equaliser for Shure V15III
 

"Serge Auckland" wrote in message
...
I'm trying to improve the frequency response of my V15III/SME 3009 S2,
and remember that Shure or SME had a little equaliser circuit that
flattened the response at the expense of a couple of dBs of output.
Something may have been published in HFN and/or Wireless World in the
'70s, but my HFNs don't go back that far, and I can't find it in my
WWs of the era.

I've been searching on-line for the circuit all afternoon, and can't
find anything. It was simply a capacitor and a resistor or two, but I
can't remember the configuration or values.

Does anyone have this info please?

Thanks

S.


--
http://audiopages.googlepages.com


Ah, now this is one I do know about - it applied more or less across the
Shure range.

Shure cartridges were designed to work into a load of 47K resistance
(like all others) in parallel with something around 360pF capacitance.
The pickup arm cables and the interconnect to the amp would account for
about 120-150pF, which leaves the cartridge underloaded and thus rather
peaky and bright.

The answer - provided you have the skills to do it - is to make up two
short phono plug-socket link cables perhaps 3-4in long and fit a 220pF
capacitor inside one of the connectors in each cable. A small ceramic
capacitor of that sort of value should be no more than about 4mm square
and will fit quite easily. Remember capacitors are additive in value
when they are connected in parallel.

Total cost with components from Maplins would be about £5. There used to
be manufactured units that did the same thing and cost about £30
apiece - much the same thing with mains spike protectors which cost
about £5 to make (retail) and sell for £100++, especially those from
rip-off Russ. You may have to dig a bit to find the capacitors though.


--
Woody

harrogate three at ntlworld dot com

Equaliser for Shure V15III
 

Woody wrote:
"Serge Auckland" wrote in message
...
I'm trying to improve the frequency response of my V15III/SME 3009 S2,
and remember that Shure or SME had a little equaliser circuit that
flattened the response at the expense of a couple of dBs of output.
Something may have been published in HFN and/or Wireless World in the
'70s, but my HFNs don't go back that far, and I can't find it in my
WWs of the era.

I've been searching on-line for the circuit all afternoon, and can't
find anything. It was simply a capacitor and a resistor or two, but I
can't remember the configuration or values.

Does anyone have this info please?

Thanks

S.


--
http://audiopages.googlepages.com


Ah, now this is one I do know about - it applied more or less across the
Shure range.

Shure cartridges were designed to work into a load of 47K resistance
(like all others) in parallel with something around 360pF capacitance.
The pickup arm cables and the interconnect to the amp would account for
about 120-150pF, which leaves the cartridge underloaded and thus rather
peaky and bright.


The way the impedances work out, you get more peakiness as the load goes
up, not down. Adding an extra 200pF to the basic cartridge and wires
will increase the level at 10kHz by about 2.5dB. This is all about the
way the capacitance resonates with the inductance of the cartridge.

d

Equaliser for Shure V15III
 

"Don Pearce" wrote in message
...
Woody wrote:
"Serge Auckland" wrote in message
...
I'm trying to improve the frequency response of my V15III/SME 3009
S2, and remember that Shure or SME had a little equaliser circuit
that flattened the response at the expense of a couple of dBs of
output. Something may have been published in HFN and/or Wireless
World in the '70s, but my HFNs don't go back that far, and I can't
find it in my WWs of the era.

I've been searching on-line for the circuit all afternoon, and can't
find anything. It was simply a capacitor and a resistor or two, but
I can't remember the configuration or values.

Does anyone have this info please?

Thanks

S.


--
http://audiopages.googlepages.com


Ah, now this is one I do know about - it applied more or less across
the Shure range.

Shure cartridges were designed to work into a load of 47K resistance
(like all others) in parallel with something around 360pF
capacitance. The pickup arm cables and the interconnect to the amp
would account for about 120-150pF, which leaves the cartridge
underloaded and thus rather peaky and bright.


The way the impedances work out, you get more peakiness as the load
goes up, not down. Adding an extra 200pF to the basic cartridge and
wires will increase the level at 10kHz by about 2.5dB. This is all
about the way the capacitance resonates with the inductance of the
cartridge.

d


Try it - it's cheap and simple enough. I used a 75EDII with this process
and it tamed it well.

Maybe one of those occassions where the theory and practice don't match?


--
Woody

harrogate three at ntlworld dot com

Equaliser for Shure V15III
 

"Woody" wrote in message
...

Maybe one of those occassions where the theory and practice don't match?


Theory and practice always match, if it appears otherwise then you've
misunderstood the theory or there's some other factors involved that you
weren't aware of. The use of shunt capacitors acroos the replay heads of
analogue tape machines to boost the HF response was standard practice, often
these capacitors were switched according to the speed selected with larger
capacitor values being used on the lower speeds.

David.

Equaliser for Shure V15III
 

"David Looser" wrote in message
...
"Woody" wrote in message
...

Maybe one of those occassions where the theory and practice don't match?


Theory and practice always match, if it appears otherwise then you've
misunderstood the theory or there's some other factors involved that you
weren't aware of. The use of shunt capacitors acroos the replay heads of
analogue tape machines to boost the HF response was standard practice,
often these capacitors were switched according to the speed selected with
larger capacitor values being used on the lower speeds.

David.


The cartridge is rather dull, not bright, and I know about the recommended
capacitative load, but that's not what I'm after. In the mid '70s, somebody,
and I think it was either Shure themselves, or possibly SME, published a
cartridge equaliser circuit which consisted of one or two resistors and a
capacitor, may have been two caps, and which had the effect of lifting the
lower treble suck-out, and the extreme hf droop. It also had the effect of
dropping the total output by a couple of dB as I recall. It's that circuit
I'm looking for and sadly can't find.

You can see the frequency response I'm getting
http://audiopages.googlepages.com/V1...full;init:.png

My other cartridges, using the same test LP are fine. As an example, my EMT
cartridge does this:-

http://audiopages.googlepages.com/TS...full;init:.png

S.

--
http://audiopages.googlepages.com

Equaliser for Shure V15III
 

Woody wrote:

"Serge Auckland" wrote in message

I'm trying to improve the frequency response of my V15III/SME 3009 S2,
and remember that Shure or SME had a little equaliser circuit that
flattened the response at the expense of a couple of dBs of output.
Something may have been published in HFN and/or Wireless World in the
'70s, but my HFNs don't go back that far, and I can't find it in my
WWs of the era.

I've been searching on-line for the circuit all afternoon, and can't
find anything. It was simply a capacitor and a resistor or two, but I
can't remember the configuration or values.

Does anyone have this info please?

Ah, now this is one I do know about - it applied more or less across the
Shure range.

Shure cartridges were designed to work into a load of 47K resistance
(like all others) in parallel with something around 360pF capacitance.
The pickup arm cables and the interconnect to the amp would account for
about 120-150pF, which leaves the cartridge underloaded and thus rather
peaky and bright.

The answer - provided you have the skills to do it - is to make up two
short phono plug-socket link cables perhaps 3-4in long and fit a 220pF
capacitor inside one of the connectors in each cable. A small ceramic
capacitor of that sort of value should be no more than about 4mm square
and will fit quite easily. Remember capacitors are additive in value
when they are connected in parallel.

Total cost with components from Maplins would be about £5. There used to
be manufactured units that did the same thing and cost about £30
apiece - much the same thing with mains spike protectors which cost
about £5 to make (retail) and sell for £100++, especially those from
rip-off Russ. You may have to dig a bit to find the capacitors though.

Maplin does have capacitors but its website is so completely borked that a
search for 220pf brought up all sorts of values such as anything from 100pF
to 47nF !

One of the worst websites I've ever seen !

Graham

Equaliser for Shure V15III
 

"Don Pearce"
Woody wrote:

Shure cartridges were designed to work into a load of 47K resistance
(like all others) in parallel with something around 360pF capacitance.
The pickup arm cables and the interconnect to the amp would account for
about 120-150pF, which leaves the cartridge underloaded and thus rather
peaky and bright.


The way the impedances work out, you get more peakiness as the load goes
up, not down.


** Shure V15IIIs definitely sound brighter with less loading capacitance -
and or an increase in the load resistance above 47 kohms.


Adding an extra 200pF to the basic cartridge and wires will increase the
level at 10kHz by about 2.5dB.


** Don just plucked that figure out of his bum.

The real number is about 0.5dB at 8 to 10 kHz.

So barely audible.

What an extra 200pF * DOES * do is drop the response at 14 - 17 kHz by 3
or 4 dB - and THAT is what a person with good hearing notices as "
duller ".


This is all about the way the capacitance resonates with the inductance of
the cartridge.


** For anyone who cares to simulate the situation, a V15III has the
following :

L = 550 mH.

R = 1370 ohms

Fo = 42kHz ( equates to about 25 pF internal C )



...... Phil

Equaliser for Shure V15III
 

Serge Auckland wrote:

"David Looser" wrote in message
...
"Woody" wrote in message
...

Maybe one of those occassions where the theory and practice don't match?


Theory and practice always match, if it appears otherwise then you've
misunderstood the theory or there's some other factors involved that
you weren't aware of. The use of shunt capacitors acroos the replay
heads of analogue tape machines to boost the HF response was standard
practice, often these capacitors were switched according to the speed
selected with larger capacitor values being used on the lower speeds.

David.


The cartridge is rather dull, not bright, and I know about the
recommended capacitative load, but that's not what I'm after. In the mid
'70s, somebody, and I think it was either Shure themselves, or possibly
SME, published a cartridge equaliser circuit which consisted of one or
two resistors and a capacitor, may have been two caps, and which had the
effect of lifting the lower treble suck-out, and the extreme hf droop.
It also had the effect of dropping the total output by a couple of dB as
I recall. It's that circuit I'm looking for and sadly can't find.

You can see the frequency response I'm getting
http://audiopages.googlepages.com/V1...full;init:.png


My other cartridges, using the same test LP are fine. As an example, my
EMT cartridge does this:-

http://audiopages.googlepages.com/TS...full;init:.png


S.


Something a little odd there because the Shure appears to have an HF
droop of more like 10dB, and using just passive components you need to
lose that much to flatten things out. The response error looks like it
can be easily corrected with a very slight tweak of a standard treble
tone control; do you have one on your amplifier?

d

Equaliser for Shure V15III
 

Phil Allison wrote:
"Don Pearce"
Woody wrote:

Shure cartridges were designed to work into a load of 47K resistance
(like all others) in parallel with something around 360pF capacitance.
The pickup arm cables and the interconnect to the amp would account for
about 120-150pF, which leaves the cartridge underloaded and thus rather
peaky and bright.

The way the impedances work out, you get more peakiness as the load goes
up, not down.


** Shure V15IIIs definitely sound brighter with less loading capacitance -
and or an increase in the load resistance above 47 kohms.


Adding an extra 200pF to the basic cartridge and wires will increase the
level at 10kHz by about 2.5dB.


** Don just plucked that figure out of his bum.

The real number is about 0.5dB at 8 to 10 kHz.

So barely audible.

What an extra 200pF * DOES * do is drop the response at 14 - 17 kHz by 3
or 4 dB - and THAT is what a person with good hearing notices as "
duller ".


This is all about the way the capacitance resonates with the inductance of
the cartridge.


** For anyone who cares to simulate the situation, a V15III has the
following :

L = 550 mH.

R = 1370 ohms

Fo = 42kHz ( equates to about 25 pF internal C )



..... Phil







I did the simulation two years ago and the results are still he

http://81.174.169.10/odds/v15iii/cartridge.html

For some reason this page doesn't work well in IE (saved as HTML from
Mathcad), but use Firefox and it'll be fine. It shows how peaky the cart
gets with added capacitance. And of course a 3dB peak at 10kHz is going
to beat flat extension to 20kHz any day when it comes to sounding bright.

d

Equaliser for Shure V15III
 

In article , Serge Auckland
wrote:

The cartridge is rather dull, not bright, and I know about the
recommended capacitative load, but that's not what I'm after. In the
mid '70s, somebody, and I think it was either Shure themselves, or
possibly SME, published a cartridge equaliser circuit which consisted
of one or two resistors and a capacitor, may have been two caps, and
which had the effect of lifting the lower treble suck-out, and the
extreme hf droop. It also had the effect of dropping the total output
by a couple of dB as I recall. It's that circuit I'm looking for and
sadly can't find.


My recollection is that Jim Sugden wrote a HFN article on that and gave the
circuit you have in mind. If I get a chance I'll have a look later today
and then report what I can find. I am pretty shure pun I have a copy of
the article. :-)

You can see the frequency response I'm getting
http://audiopages.googlepages.com/V1...full;init:.png

I would be quite wary of test LPs. I've been comparing some and the
responses they give are all over the place!

Slainte,

Jim

--
Change 'noise' to 'jcgl' 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

Equaliser for Shure V15III
 

On 03 Oct, wrote:


My recollection is that Jim Sugden wrote a HFN article on that and gave
the circuit you have in mind. If I get a chance I'll have a look later
today and then report what I can find. I am pretty shure pun I have a
copy of the article. :-)

Found this quicker that I expected!

HFN April 1968 "Flatten your Head" by Jim Sugden.

The circuit he published uses a shunt of a 330pF and 3k3 in series.

He also used a *series* cap of 0.047microfarads to control the rise at LF,
but said this was optional. Also cautioned that some amps (e.g. his
Radford) didn't like this as the higher LF source impedance led to more
hum.

The above was for the V15/II, not III. I do recall that Shure did sell an
adaptor, but haven't found any details. I assume that most people - inc
myself - were quite happy with just a capacitance shunt with no extras.

FWIW He then reported +/-1dB from 30Hz to 16kHz, which doesn't seem to me
much different to a V15III and a plain cap shunt. However you may find that
fiddling slightly with the values will get flatter response. That said, we
may be in the territory where results will vary from one example to the
next! :-)

Slainte,

Jim

--
Change 'noise' to 'jcgl' 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

Equaliser for Shure V15III
 

In article , Don Pearce
wrote:


I did the simulation two years ago and the results are still he

http://81.174.169.10/odds/v15iii/cartridge.html

For some reason this page doesn't work well in IE (saved as HTML from
Mathcad), but use Firefox and it'll be fine. It shows how peaky the cart
gets with added capacitance. And of course a 3dB peak at 10kHz is going
to beat flat extension to 20kHz any day when it comes to sounding
bright.

I'd be interested to know how you did the simulation. In particular, if/how
you included the coupling between the mechanical resonance(s) and
electronic loading.

Slainte,

Jim

--
Change 'noise' to 'jcgl' 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

Equaliser for Shure V15III
 

Don Pearce wrote:

Phil Allison wrote:
"Don Pearce"
Woody wrote:

Shure cartridges were designed to work into a load of 47K resistance
(like all others) in parallel with something around 360pF capacitance.
The pickup arm cables and the interconnect to the amp would account for
about 120-150pF, which leaves the cartridge underloaded and thus rather
peaky and bright.

The way the impedances work out, you get more peakiness as the load goes
up, not down.


** Shure V15IIIs definitely sound brighter with less loading capacitance -
and or an increase in the load resistance above 47 kohms.


Adding an extra 200pF to the basic cartridge and wires will increase the
level at 10kHz by about 2.5dB.


** Don just plucked that figure out of his bum.

The real number is about 0.5dB at 8 to 10 kHz.

So barely audible.

What an extra 200pF * DOES * do is drop the response at 14 - 17 kHz by 3
or 4 dB - and THAT is what a person with good hearing notices as "
duller ".


This is all about the way the capacitance resonates with the inductance of
the cartridge.


** For anyone who cares to simulate the situation, a V15III has the
following :

L = 550 mH.

R = 1370 ohms

Fo = 42kHz ( equates to about 25 pF internal C )


I did the simulation two years ago and the results are still he

http://81.174.169.10/odds/v15iii/cartridge.html

For some reason this page doesn't work well in IE (saved as HTML from
Mathcad), but use Firefox and it'll be fine. It shows how peaky the cart
gets with added capacitance. And of course a 3dB peak at 10kHz is going
to beat flat extension to 20kHz any day when it comes to sounding bright.

And some nutcases think CD's crap !

Graham

Equaliser for Shure V15III
 

Jim Lesurf wrote:

On 03 Oct, wrote:

My recollection is that Jim Sugden wrote a HFN article on that and gave
the circuit you have in mind. If I get a chance I'll have a look later
today and then report what I can find. I am pretty shure pun I have a
copy of the article. :-)

Found this quicker that I expected!

HFN April 1968 "Flatten your Head" by Jim Sugden.

The circuit he published uses a shunt of a 330pF and 3k3 in series.

He also used a *series* cap of 0.047microfarads to control the rise at LF,
but said this was optional. Also cautioned that some amps (e.g. his
Radford) didn't like this as the higher LF source impedance led to more
hum.

The above was for the V15/II, not III. I do recall that Shure did sell an
adaptor, but haven't found any details. I assume that most people - inc
myself - were quite happy with just a capacitance shunt with no extras.

FWIW He then reported +/-1dB from 30Hz to 16kHz, which doesn't seem to me
much different to a V15III and a plain cap shunt. However you may find that
fiddling slightly with the values will get flatter response. That said, we
may be in the territory where results will vary from one example to the
next! :-)

What joy one no longer has to worry about such things.

I can still recall lining up the tape machines at Sound Developments. And of
course when a new batch of tape came in you had to be very careful.

Does EMI 815 sound familiar to anyone. It was their stock 'standard' tape there
IIRC. They had a couple of Studers and a fair few of Ampexes. I liked the
Ampexes, far more reliable. The MM1100 or was it 1200 ? impressed me
considerably.

Graham

Equaliser for Shure V15III
 

Eeyore wrote:

Don Pearce wrote:

Phil Allison wrote:
"Don Pearce"
Woody wrote:

Shure cartridges were designed to work into a load of 47K resistance
(like all others) in parallel with something around 360pF capacitance.
The pickup arm cables and the interconnect to the amp would account for
about 120-150pF, which leaves the cartridge underloaded and thus rather
peaky and bright.

The way the impedances work out, you get more peakiness as the load goes
up, not down.

** Shure V15IIIs definitely sound brighter with less loading capacitance -
and or an increase in the load resistance above 47 kohms.


Adding an extra 200pF to the basic cartridge and wires will increase the
level at 10kHz by about 2.5dB.

** Don just plucked that figure out of his bum.

The real number is about 0.5dB at 8 to 10 kHz.

So barely audible.

What an extra 200pF * DOES * do is drop the response at 14 - 17 kHz by 3
or 4 dB - and THAT is what a person with good hearing notices as "
duller ".


This is all about the way the capacitance resonates with the inductance of
the cartridge.

** For anyone who cares to simulate the situation, a V15III has the
following :

L = 550 mH.

R = 1370 ohms

Fo = 42kHz ( equates to about 25 pF internal C )

I did the simulation two years ago and the results are still he

http://81.174.169.10/odds/v15iii/cartridge.html

For some reason this page doesn't work well in IE (saved as HTML from
Mathcad), but use Firefox and it'll be fine. It shows how peaky the cart
gets with added capacitance. And of course a 3dB peak at 10kHz is going
to beat flat extension to 20kHz any day when it comes to sounding bright.

And some nutcases think CD's crap !


Yes, that's a bit harsh - I use the one in the car every so often, when
there's nothing on the radio. No point ruling them out altogether.

Rob

Equaliser for Shure V15III
 

"Don Pearce"
Phil Allison wrote:

The way the impedances work out, you get more peakiness as the load goes
up, not down.


** Shure V15IIIs definitely sound brighter with less loading
apacitance - and or an increase in the load resistance above 47 kohms.


Adding an extra 200pF to the basic cartridge and wires will increase the
level at 10kHz by about 2.5dB.


** Don just plucked that figure out of his bum.

The real number is about 0.5dB at 8 to 10 kHz.

So barely audible.

What an extra 200pF * DOES * do is drop the response at 14 - 17 kHz
by 3 or 4 dB - and THAT is what a person with good hearing notices as
" duller ".


This is all about the way the capacitance resonates with the inductance
of the cartridge.


** For anyone who cares to simulate the situation, a V15III has the
following :

L = 550 mH R = 1370 ohms Fo = 42kHz ( equates to about 25 pF
internal C )



I did the simulation two years ago and the results are still he

http://81.174.169.10/odds/v15iii/cartridge.html



** I tested using a ** REAL ** Shure V15III - owned one since 1978,
long out of use now.

No peak around 10kHz is created by adding 200 pF (or even 400pF ) to 150pF
with a 47kohms load.

Proves yet again the absolute folly of naive simualtions.

Fools like Jim Leserf and Don the drongo you are world champs at that fake
art.





...... Phil

Equaliser for Shure V15III
 

In article ,
Eeyore wrote:
Does EMI 815 sound familiar to anyone.

Yup. Best kept for tying up the roses. ;-)

It was their stock 'standard' tape there
IIRC. They had a couple of Studers and a fair few of Ampexes. I liked the
Ampexes, far more reliable. The MM1100 or was it 1200 ? impressed me
considerably.

Never had much to do with Ampex audio recorders but loved and hated Studer
in the same breath.

--
*Never kick a cow pat on a hot day *

Dave Plowman London SW
To e-mail, change noise into sound.

Equaliser for Shure V15III
 

Jim Lesurf wrote:
In article , Don Pearce
wrote:


I did the simulation two years ago and the results are still he

http://81.174.169.10/odds/v15iii/cartridge.html

For some reason this page doesn't work well in IE (saved as HTML from
Mathcad), but use Firefox and it'll be fine. It shows how peaky the cart
gets with added capacitance. And of course a 3dB peak at 10kHz is going
to beat flat extension to 20kHz any day when it comes to sounding
bright.

I'd be interested to know how you did the simulation. In particular, if/how
you included the coupling between the mechanical resonance(s) and
electronic loading.

Slainte,

Jim


The maths you see is all of it. The intention wasn't to model how flat
the cartridge was, merely how its output changed in response to
differing capacitive loads.

d

Equaliser for Shure V15III
 

Phil Allison wrote:
"Don Pearce"
Phil Allison wrote:
The way the impedances work out, you get more peakiness as the load goes
up, not down.

** Shure V15IIIs definitely sound brighter with less loading
apacitance - and or an increase in the load resistance above 47 kohms.


Adding an extra 200pF to the basic cartridge and wires will increase the
level at 10kHz by about 2.5dB.

** Don just plucked that figure out of his bum.

The real number is about 0.5dB at 8 to 10 kHz.

So barely audible.

What an extra 200pF * DOES * do is drop the response at 14 - 17 kHz
by 3 or 4 dB - and THAT is what a person with good hearing notices as
" duller ".


This is all about the way the capacitance resonates with the inductance
of the cartridge.

** For anyone who cares to simulate the situation, a V15III has the
following :

L = 550 mH R = 1370 ohms Fo = 42kHz ( equates to about 25 pF
internal C )


I did the simulation two years ago and the results are still he

http://81.174.169.10/odds/v15iii/cartridge.html



** I tested using a ** REAL ** Shure V15III - owned one since 1978,
long out of use now.

No peak around 10kHz is created by adding 200 pF (or even 400pF ) to 150pF
with a 47kohms load.

Proves yet again the absolute folly of naive simualtions.

Fools like Jim Leserf and Don the drongo you are world champs at that fake
art.



You never made any such measurement. In fact you have never produced the
slightest shred of evidence that you have ever done anything in your life.

d

Equaliser for Shure V15III
 

Don Pearce the Lying Asshole

Phil Allison

I did the simulation two years ago and the results are still he

http://81.174.169.10/odds/v15iii/cartridge.html



** I tested using a ** REAL ** Shure V15III - owned one since
1978, long out of use now.

No peak around 10kHz is created by adding 200 pF (or even 400pF ) to
150pF with a 47kohms load.

Proves yet again the absolute folly of naive simulations.

Fools like Jim Leserf and Don the drongo you are world champs at that
fake art.


You never made any such measurement.


** You are nothing but a CRIMINAL LIAR - Pearce.

Get a real V15III and find out how wrong you are.


In fact you have never produced the slightest shred of evidence that you
have ever done anything in your life.


** There is no-one so blind as a congenital, lying pommy ****wit who refuses
to see.




...... Phil

Equaliser for Shure V15III
 

Phil Allison wrote:
Don Pearce the Lying Asshole
Phil Allison
I did the simulation two years ago and the results are still he

http://81.174.169.10/odds/v15iii/cartridge.html


** I tested using a ** REAL ** Shure V15III - owned one since
1978, long out of use now.

No peak around 10kHz is created by adding 200 pF (or even 400pF ) to
150pF with a 47kohms load.

Proves yet again the absolute folly of naive simulations.

Fools like Jim Leserf and Don the drongo you are world champs at that
fake art.

You never made any such measurement.


** You are nothing but a CRIMINAL LIAR - Pearce.

Get a real V15III and find out how wrong you are.


In fact you have never produced the slightest shred of evidence that you
have ever done anything in your life.


** There is no-one so blind as a congenital, lying pommy ****wit who refuses
to see.




..... Phil





So we are to believe that a) Shure don't know the electrical
characteristics of their cartridges, or b) the laws of physics have been
suspended especially for them, or c) you got it wrong again. I know
where my money is.

d

Don Pearce the Lying Asshole
 

Don Pearce the Lying Asshole

I did the simulation two years ago and the results are still he

http://81.174.169.10/odds/v15iii/cartridge.html


** I tested using a ** REAL ** Shure V15III - owned one since
1978, long out of use now.

No peak around 10kHz is created by adding 200 pF (or even 400pF ) to
150pF with a 47kohms load.

Proves yet again the absolute folly of naive simulations.

Fools like Jim Leserf and Don the drongo you are world champs at that
fake art.

You never made any such measurement.


** You are nothing but a CRIMINAL LIAR - Pearce.

Get a real V15III and find out how wrong you are.


In fact you have never produced the slightest shred of evidence that you
have ever done anything in your life.


** There is no-one so blind as a congenital, lying pommy ****wit who
refuses to see.



So we are to believe....


** NOTHING a LYING PILE OF ****

called " Don Pearce " ever says.




...... Phil

Equaliser for Shure V15III
 

"Serge Auckland" wrote in
message

I'm trying to improve the frequency response of my
V15III/SME 3009 S2, and remember that Shure or SME had a
little equaliser circuit that flattened the response at
the expense of a couple of dBs of output. Something may
have been published in HFN and/or Wireless World in the
'70s, but my HFNs don't go back that far, and I can't
find it in my WWs of the era.
I've been searching on-line for the circuit all
afternoon, and can't find anything. It was simply a
capacitor and a resistor or two, but I can't remember the
configuration or values.

In the day of, I was a V15 fan. I owned a number of V15 III's and IV's, in
different turntables. I also experimented with using a V15 stylus assembly
in a M91 cartridge body, which required trimming a little plastic.

As others have noted, the trick is to adjust the capacitive load for
flattest possible response with the test record of your choice. You can also
do it by ear, if you have an educated ear.

I built a preamp that had variable capacitors on the input to facilitate
this adjustment. A number of commercial preamps, including Holman's APT
preamp also had this feature.

The usual subjective impression is that V15 cartridges are dull sounding
without proper capacitive loading. This effect may have been somewhat
reduced in later versions, but it was very strong in the II.

Equaliser for Shure V15III
 

"Arny Krueger"


In the day of, I was a V15 fan. I owned a number of V15 III's and IV's, in
different turntables. I also experimented with using a V15 stylus assembly
in a M91 cartridge body, which required trimming a little plastic.

As others have noted, the trick is to adjust the capacitive load for
flattest possible response with the test record of your choice. You can
also do it by ear, if you have an educated ear.

I built a preamp that had variable capacitors on the input to facilitate
this adjustment. A number of commercial preamps, including Holman's APT
preamp also had this feature.

The usual subjective impression is that V15 cartridges are dull sounding
without proper capacitive loading.


** Quite the REVERSE is true.

Shure V15s sound bright without additional C loading, beyond that found in
most RIAA stages.


This effect may have been somewhat reduced in later versions, but it was
very strong in the II.


** It was very noticeable with V15IIIs also

- to anyone with good hearing and speakers with good response to 20kHz.



...... Phil