Hello all,

I want to change a linear 50k pot to an audio taper 50k pot in my
Fender Blues Junior guitar amp.
Do you know where I can find such a potentiometer ?
I have try to find it in Farnell catalog, with no success ...

I have put some pictures:
http://scalbert.dyndns.org/bj/IMG_0021.JPG
http://scalbert.dyndns.org/bj/IMG_0022.JPG
http://scalbert.dyndns.org/bj/IMG_0023.JPG
http://scalbert.dyndns.org/bj/IMG_0025.JPG
http://scalbert.dyndns.org/bj/IMG_0026.JPG

Thanks very much !

Olivier

wrote in message
oups.com...
Hello all,

I want to change a linear 50k pot to an audio taper 50k pot in my
Fender Blues Junior guitar amp.
Do you know where I can find such a potentiometer ?
I have try to find it in Farnell catalog, with no success ...

This should be a common item, a PC-board-mounted audio-taper potentiometer.
It may be nominally 47k instead of 50k and might be called log taper rather
than audio taper (similar but not identical). What part of the world are
you in?

Meat Plow wrote:
On Sat, 09 Jun 2007 05:32:41 -0700, wrote:

Hello all,

I want to change a linear 50k pot to an audio taper 50k pot in my

Olivier

Ask in alt.guitar.amps

surface mount piece is a bitch to replace.

www.mouser.com ... best

www.digikey.com ... good

www.jameco.com .. better than good

A *certified" Fender repair shop would be TOO obvious.


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On Jun 9, 4:44 pm, "mc" wrote:
wrote in message

oups.com...

Hello all,

I want to change a linear 50k pot to an audio taper 50k pot in my
Fender Blues Junior guitar amp.
Do you know where I can find such a potentiometer ?
I have try to find it in Farnell catalog, with no success ...

This should be a common item, a PC-board-mounted audio-taper potentiometer.
It may be nominally 47k instead of 50k and might be called log taper rather
than audio taper (similar but not identical). What part of the world are
you in?

I am living in Belgium. They are less and less electronics shops, so
generally I buy my components at Farnell. But here I do not find any
references ...

Is there a manufacturer's name on the potentiometer? If so, Google for it,
and find a distributor.

Let me suggest another approach. Add a 27k or 47k resistor from the wiper
(middle contact) of the potentiometer to the low end of the potentiometer.
This is a very old trick for making a linear potentiometer behave more like
an audio taper. It's not perfect, but it may achieve what you want.

Also, write to the people at
www.vibroworld.com
and see what they know.

And look at
http://www.ctscorp.com/components/potentiometers.htm
which is probably the manufacturer. If you can identify the part you want,
they can probably tell you where you can buy it in small quantities.

On Jun 9, 7:47 pm, "mc" wrote:
Is there a manufacturer's name on the potentiometer? If so, Google for it,
and find a distributor.

Let me suggest another approach. Add a 27k or 47k resistor from the wiper
(middle contact) of the potentiometer to the low end of the potentiometer.
This is a very old trick for making a linear potentiometer behave more like
an audio taper. It's not perfect, but it may achieve what you want.

Also, write to the people atwww.vibroworld.com
and see what they know.

And look athttp://www.ctscorp.com/components/potentiometers.htm
which is probably the manufacturer. If you can identify the part you want,
they can probably tell you where you can buy it in small quantities.

Hi MC,

Cool, I think it is a CTS Corp Series 296. I will contact them. Thanks
very much.
Olivier

I want to change a linear 50k pot to an audio taper 50k pot

Only if you find a AT pot to fit in the socket..

You could chuckle tap off the LT pot and adjust the 'bend' where
it changes to promote an audio able 'ear friendly' taper. Is what you
want to do going to happen with a taper change? Is it worth it?


JJTj










-----------------------------------------------------
Seems I forgot the next verse..
oh well, I guess it pays to rehearse..
the lyric sheet's so hard to find..
what are the words, oh nevermind...

Weird Al
-----------------------------------------------------

In article ,
"mc" wrote:

wrote in message
oups.com...
Hello all,

I want to change a linear 50k pot to an audio taper 50k pot in my
Fender Blues Junior guitar amp.
Do you know where I can find such a potentiometer ?
I have try to find it in Farnell catalog, with no success ...

This should be a common item, a PC-board-mounted audio-taper potentiometer.
It may be nominally 47k instead of 50k and might be called log taper rather
than audio taper (similar but not identical). What part of the world are
you in?

It's been a *long* time, but I believe that an audio taper pot is
ANTIlog, not log. A log pot will work only if you hook it up to get
louder as you crank it CCW.

Isaac

On 9 Jun, 13:32, "
wrote:

Hello all,

I want to change a linear 50k pot to an audio taper 50k pot in my
Fender Blues Junior guitar amp.
Do you know where I can find such a potentiometer ?
I have try to find it in Farnell catalog, with no success ...

I have put some pictures:http://scalbert.dyndns.org/bj/IMG_00...j/IMG_0026.JPG

Thanks very much !

Olivier

So-called log pots arent really log. Theyre linear over most of their
scale, with a short section of lower R per distance material at the
bottom end. It may be quicker to reduce the R of the bottom 10%-20% of
the track than find a replacement. This could be done with some
graphite dots at the edge of the track, where the wiper doesnt go.
Graphite is very conductive, so use only the tiniest amout, and dont
get it on the side of the track base, where it coudl conduct to case.


NT

Lost in the Wasteland wrote:

surface mount piece is a bitch to replace.

It's not surface mount.

It has standard PCB tails.

Graham

It's been a *long* time, but I believe that an audio taper pot is
ANTIlog, not log. A log pot will work only if you hook it up to get
louder as you crank it CCW.

Not as I understand it.

Linear taper = output voltage proportional to rotation

Audio taper = lower at mid-scale than linear

Log taper = same, slightly different curvature
(not truly logarithmic because there is no logarithm of 0)

Antilog taper = higher at mid-scale than linear

To make it get louder instead of softer as you turn it CCW, you reverse the
connections to the 2 ends of the potentiometer, whichever taper you have.

On Sat, 09 Jun 2007 05:32:41 -0700, "
wrote:

Hello all,

I want to change a linear 50k pot to an audio taper 50k pot in my
Fender Blues Junior guitar amp.
Do you know where I can find such a potentiometer ?
I have try to find it in Farnell catalog, with no success ...

I have put some pictures:
http://scalbert.dyndns.org/bj/IMG_0021.JPG
http://scalbert.dyndns.org/bj/IMG_0022.JPG
http://scalbert.dyndns.org/bj/IMG_0023.JPG
http://scalbert.dyndns.org/bj/IMG_0025.JPG
http://scalbert.dyndns.org/bj/IMG_0026.JPG

Thanks very much !

Olivier

Your Farnell Belgium part number is the same as in Australia (and the
rest of the world) - 1191756
http://be.farnell.com/jsp/Passive+Co...sp?sku=1191756

Ross Herbert wrote:

On Sat, 09 Jun 2007 05:32:41 -0700, "
wrote:

Hello all,

I want to change a linear 50k pot to an audio taper 50k pot in my
Fender Blues Junior guitar amp.
Do you know where I can find such a potentiometer ?
I have try to find it in Farnell catalog, with no success ...

I have put some pictures:
http://scalbert.dyndns.org/bj/IMG_0021.JPG
http://scalbert.dyndns.org/bj/IMG_0022.JPG
http://scalbert.dyndns.org/bj/IMG_0023.JPG
http://scalbert.dyndns.org/bj/IMG_0025.JPG
http://scalbert.dyndns.org/bj/IMG_0026.JPG

Thanks very much !

Olivier

Your Farnell Belgium part number is the same as in Australia (and the
rest of the world) - 1191756
http://be.farnell.com/jsp/Passive+Co...sp?sku=1191756

Wrong size.

Graham

Your Farnell Belgium part number is the same as in Australia (and the
rest of the world) - 1191756
http://be.farnell.com/jsp/Passive+Co...sp?sku=1191756



I see no indication that that one is audio or log taper. Is it?

On Tue, 12 Jun 2007 11:39:01 -0400, "mc"
wrote:

Your Farnell Belgium part number is the same as in Australia (and
the
rest of the world) - 1191756

http://be.farnell.com/jsp/Passive+Co...sp?sku=1191756



I see no indication that that one is audio or log taper. Is it?


'A' taper is audio taper. The 50KA Alps is audio taper - that is why
the A at the end.

On Tue, 12 Jun 2007 12:42:32 GMT, Eeyore
wrote:



Ross Herbert wrote:

On Sat, 09 Jun 2007 05:32:41 -0700, "
wrote:

Hello all,

I want to change a linear 50k pot to an audio taper 50k pot in my
Fender Blues Junior guitar amp.
Do you know where I can find such a potentiometer ?
I have try to find it in Farnell catalog, with no success ...

I have put some pictures:
http://scalbert.dyndns.org/bj/IMG_0021.JPG
http://scalbert.dyndns.org/bj/IMG_0022.JPG
http://scalbert.dyndns.org/bj/IMG_0023.JPG
http://scalbert.dyndns.org/bj/IMG_0025.JPG
http://scalbert.dyndns.org/bj/IMG_0026.JPG

Thanks very much !

Olivier

Your Farnell Belgium part number is the same as in Australia (and
the
rest of the world) - 1191756

http://be.farnell.com/jsp/Passive+Co...sp?sku=1191756

Wrong size.

Graham


The OP's pics look like a 9mm pot to me - and so is the Alps pot which
I linked to.

Ross Herbert wrote:

Eeyore wrote:

Wrong size.


The OP's pics look like a 9mm pot to me

It's not.

The 9mm types all have a 'sealed' body. His doesn't. 12mm I think.

Graham