Anti-Log 500K/250K Ohms, 2 Watts Supplier

[opacheco]

Hi,

Does someone know where I can find a detail supplier for a couples of Anti-Log 500K and Anti-Log 250K Ohms, 2 Watts Supplier??

I have searched for that in the web and found nothing at all!

Thanks for any advise
Opacheco.

 

[gyraf]

2W in 250K Ohm is a bit more than 700V.

Are you sure you need this much?

Jakob E.

 

[opacheco]

2W in 250K Ohm is a bit more than 700V.

Are you sure you need this much?

Jakob E.

Yes, but 650Volts or 500 at least will be fine if I couldn't find them....... I am replacing the existent olds pots for a pot taper more appropriate, you know; rotation versus change.......Why do you ask this??, Do you have an idea where I can find them??


Thanks a lot,
Opacheco.

 

[opacheco]

Any Comment?

Opacheco.

 

[emrr]

Why do you ask this??, Do you have an idea where I can find them??

What do you need them for, that's why he asks.....

 

[opacheco]

Why do you ask this??, Do you have an idea where I can find them??

What do you need them for, that's why he asks.....

emrr,

The Rotation versus Change in a linear or log taper isn't appropriate for the control. That is the reason that I need to find a supplier.

Opacheco.

 

[joaquins]

I think the question is the circuit where they are going to, since that high value with that power looks strange. The thing is the application, not why you want them.

JS

 

[opacheco]

I think the question is the circuit where they are going to, since that high value with that power looks strange. The thing is the application, not why you want them.

JS

Dear JS,

The Guitar Pots are 2 Watts!!....that is not the problem, the problem is the ANTI-LOG TAPER potentiometer supplier!!. In the past Allen Bradley did these kind of bigger pots like CLAROSTAT and another manufactures too, and I am looking for for a good well done sealed pot with no maintenance, not the little ones Chinese open to the dust and cheap.

The circuit is not important.

Opacheco.

 

[joaquins]

I think the question is the circuit where they are going to, since that high value with that power looks strange. The thing is the application, not why you want them.

JS

Dear JS,

The Guitar Pots are 2 Watts!!....that is not the problem, the problem is the ANTI-LOG TAPER potentiometer supplier!!. In the past Allen Bradley did these kind of bigger pots like CLAROSTAT and another manufactures too, and I am looking for for a good well done sealed pot with no maintenance, not the little ones Chinese open to the dust and cheap.

The circuit is not important.

Opacheco.

The thing is that you could get smaller pots in different tapers more easily, so, if there is no need for 2W then you may be making your life easier. Plus, linear pots are usually higher voltage rating, and there is the voltage restriction as well, so getting 2W/500K (so about 1kV) anti log pots will be quite tricky.

I'll take an example just to clarify, here are the data sheets:
http://www.alphapotentiometers.net/html/16mm_pot_2.html
http://www.alphapotentiometers.net/html/24mm_pot_2.html

I've just picked 2 different options, the two bigger options in this case. 16mm comes in A, B and C tapers. 22mm option just A and B. In both cases the linear taper is rated for twice the power and twice the voltage. Also in this case the bigger one can mange twice the power and doesn't came in C taper as you are looking for, but this is just a random example. In this case the 22mm pot is just 0.5W and I've seen a lot of those (or smaller) inside guitars, so I don't think guitar pots are actually 2W, at least not usually.

There are better pots that the ones I've quoted here, I know, it's just a random example to show you why we are asking the reason why you are looking 2W, if you don't have 1kV so you could use smaller pots in you application this will make the search easier.

JS

 

[fazeka]

For whatever it's worth (you can ask them if they have tracks closer to 250k and 500k):

 

[opacheco]

I think the question is the circuit where they are going to, since that high value with that power looks strange. The thing is the application, not why you want them.

JS

Dear JS,

The Guitar Pots are 2 Watts!!....that is not the problem, the problem is the ANTI-LOG TAPER potentiometer supplier!!. In the past Allen Bradley did these kind of bigger pots like CLAROSTAT and another manufactures too, and I am looking for for a good well done sealed pot with no maintenance, not the little ones Chinese open to the dust and cheap.

The circuit is not important.

Opacheco.

The thing is that you could get smaller pots in different tapers more easily, so, if there is no need for 2W then you may be making your life easier. Plus, linear pots are usually higher voltage rating, and there is the voltage restriction as well, so getting 2W/500K (so about 1kV) anti log pots will be quite tricky.

I'll take an example just to clarify, here are the data sheets:
http://www.alphapotentiometers.net/html/16mm_pot_2.html
http://www.alphapotentiometers.net/html/24mm_pot_2.html

I've just picked 2 different options, the two bigger options in this case. 16mm comes in A, B and C tapers. 22mm option just A and B. In both cases the linear taper is rated for twice the power and twice the voltage. Also in this case the bigger one can mange twice the power and doesn't came in C taper as you are looking for, but this is just a random example. In this case the 22mm pot is just 0.5W and I've seen a lot of those (or smaller) inside guitars, so I don't think guitar pots are actually 2W, at least not usually.

There are better pots that the ones I've quoted here, I know, it's just a random example to show you why we are asking the reason why you are looking 2W, if you don't have 1kV so you could use smaller pots in you application this will make the search easier.

JS

Dear JS,

I appreciate your advises but these cheap pot durability is for a month at maximum!!....I don't need the smaller pot instance I need the large one, 1 inch of diameter at least , 1/4 Solid Shaft, 3/8" thread I am not skimping cost in few parts that I need for a really good vintage unit!!.....Please the issue here is: Where I can find a seller company (a supplier) for them?. That's!

Here Durability is the point, not the cost!....Smaller pots are a garbage, few turns and goes fail, noise, crack noise...The Good Pots are almost forever like ALLEN BRADLEY, CLAROSTAT, OHMITE ones !!....

Thanks a lot,
Opacheco.

 

[opacheco]

For whatever it's worth (you can ask them if they have tracks closer to 250k and 500k):

fazeka
thanks for the link!

Opacheco.

 

[joaquins]

...
Dear JS,

I appreciate your advises but these cheap pot durability is for a month at maximum!!....I don't need the smaller pot instance I need the large one, 1 inch of diameter at least , 1/4 Solid Shaft, 3/8" thread I am not skimping cost in few parts that I need for a really good vintage unit!!.....Please the issue here is: Where I can find a seller company (a supplier) for them?. That's!

Here Durability is the point, not the cost!....Smaller pots are a garbage, few turns and goes fail, noise, crack noise...The Good Pots are almost forever like ALLEN BRADLEY, CLAROSTAT, OHMITE ones !!....

Thanks a lot,
Opacheco.

I know that, I just took those as an example because they have easy to find and read data sheets, the thing is the relationship between the value and taper and max spec. If you really need 2W at 500k you are probably going to need pots rated for more than 2W, since max voltage will be limiting you. Also C taper makes things worse so you are probably have to look a pot which linear tapers version is rated for 5W/2kV at least, which is quite hard to find, and then find a antilog taper at that high value.

I'd really like to know the application to see if you really need that rating, that's all. I know the problem with reliability of cheap pots, but that's has nothing to do with the size of the pot, I've seen 9mm pots working without a single noise for more than 20 years. A reputable manufacturer sealed pot is what you are looking in this aspect, not size. I say again, alpha was just an example of the relation between different tapers and different rating restrictions (power and voltage) so in your case you are limited by both of those for the same pot, to really get 2W you need 1kV. Also guitar pots are not quite rated for this so I wouldn't say there are 2W 500k pots inside guitars, they aren't 2W and even less 1kV.

Good luck finding this, if you say the application we may help you to narrow the specs so it's easier for you to find them, if not you probably end looking for custom made ones or looking them in some obscure places if the quantity isn't high enough.

JS

 

[opacheco]

...
Dear JS,

I appreciate your advises but these cheap pot durability is for a month at maximum!!....I don't need the smaller pot instance I need the large one, 1 inch of diameter at least , 1/4 Solid Shaft, 3/8" thread I am not skimping cost in few parts that I need for a really good vintage unit!!.....Please the issue here is: Where I can find a seller company (a supplier) for them?. That's!

Here Durability is the point, not the cost!....Smaller pots are a garbage, few turns and goes fail, noise, crack noise...The Good Pots are almost forever like ALLEN BRADLEY, CLAROSTAT, OHMITE ones !!....

Thanks a lot,
Opacheco.

I know that, I just took those as an example because they have easy to find and read data sheets, the thing is the relationship between the value and taper and max spec. If you really need 2W at 500k you are probably going to need pots rated for more than 2W, since max voltage will be limiting you. Also C taper makes things worse so you are probably have to look a pot which linear tapers version is rated for 5W/2kV at least, which is quite hard to find, and then find a antilog taper at that high value.

I'd really like to know the application to see if you really need that rating, that's all. I know the problem with reliability of cheap pots, but that's has nothing to do with the size of the pot, I've seen 9mm pots working without a single noise for more than 20 years. A reputable manufacturer sealed pot is what you are looking in this aspect, not size. I say again, alpha was just an example of the relation between different tapers and different rating restrictions (power and voltage) so in your case you are limited by both of those for the same pot, to really get 2W you need 1kV. Also guitar pots are not quite rated for this so I wouldn't say there are 2W 500k pots inside guitars, they aren't 2W and even less 1kV.

Good luck finding this, if you say the application we may help you to narrow the specs so it's easier for you to find them, if not you probably end looking for custom made ones or looking them in some obscure places if the quantity isn't high enough.

JS

I told before!!....This is a repair vintage old Vintage unit!!....1w, 2w that no matter!!, the antilog taper is the issue here!!....Anyway: Maybe someone know where I can find these kind of bigger and huge potentiometer!!...Do you think if you blend a pot with BIG know but little pot inside!!!.....No fine adjustment because the angle restrictions but in a large diameter a this is piece of cake!!.....Man, the power isn't the problem!!.....SUPPLIER ANTI-LOG is the problem and more important in this repair process!!....

Opacheco.

 

[abbey road d enfer]

I told before!!....This is a repair vintage old Vintage unit!!....1w, 2w that no matter!!, the antilog taper is the issue here!!....Anyway: Maybe someone know where I can find these kind of bigger and huge potentiometer!!...Do you think if you blend a pot with BIG know but little pot inside!!!.....No fine adjustment because the angle restrictions but in a large diameter a this is piece of cake!!.....Man, the power isn't the problem!!.....SUPPLIER ANTI-LOG is the problem and more important in this repair process!!....

Opacheco.

Opacheco, your tone is not very pleasing to people who want help you!

You say the circuit is not relevant, but in most guitar amps, the voltages are about 30Vac or less, so the dissipation in a 250k pot is less than 4mW. You cannot base your selection on rated power. That should open the options. Your concern is mechanical.
Your ASSumption that a big pot would have better durability than a small one is flawed.
There are small pots, like Vishay/Sfernice P11 with a guaranteed 50 000 cycles endurance and all the important mechanical and electrical parameters are documented.
They make anti-log, but generally on special order; I know they do one-offs.
Finding pots today is a very difficult task. Most of the industry has converted to very small pots with serrated or D-shaped shafts (that allow the use of cheap knobs). There are exceptions; CTS still makes big (24mm) old-style 50k and 3 Meg reverse-log pots because there is demand on the vintage market, but they are not willing to do small-quantities.

 

[moamps]

Does someone know where I can find a detail supplier for a couples of Anti-Log 500K and Anti-Log 250K Ohms, 2 Watts Supplier??

http://www.banzaimusic.com/PEC-MIL-MO-REV-250k.html
http://www.banzaimusic.com/PEC-MIL-MO-REV-500k.html

 

[opacheco]

I told before!!....This is a repair vintage old Vintage unit!!....1w, 2w that no matter!!, the antilog taper is the issue here!!....Anyway: Maybe someone know where I can find these kind of bigger and huge potentiometer!!...Do you think if you blend a pot with BIG know but little pot inside!!!.....No fine adjustment because the angle restrictions but in a large diameter a this is piece of cake!!.....Man, the power isn't the problem!!.....SUPPLIER ANTI-LOG is the problem and more important in this repair process!!....

Opacheco.

Opacheco, your tone is not very pleasing to people who want help you!

You say the circuit is not relevant, but in most guitar amps, the voltages are about 30Vac or less, so the dissipation in a 250k pot is less than 4mW. You cannot base your selection on rated power. That should open the options. Your concern is mechanical.
Your ASSumption that a big pot would have better durability than a small one is flawed.
There are small pots, like Vishay/Sfernice P11 with a guaranteed 50 000 cycles endurance and all the important mechanical and electrical parameters are documented.
They make anti-log, but generally on special order; I know they do one-offs.
Finding pots today is a very difficult task. Most of the industry has converted to very small pots with serrated or D-shaped shafts (that allow the use of cheap knobs). There are exceptions; CTS still makes big (24mm) old-style 50k and 3 Meg reverse-log pots because there is demand on the vintage market, but they are not willing to do small-quantities.

Abbey, thanks a lot
Opacheco

 

[opacheco]

Does someone know where I can find a detail supplier for a couples of Anti-Log 500K and Anti-Log 250K Ohms, 2 Watts Supplier??

http://www.banzaimusic.com/PEC-MIL-MO-REV-250k.html
http://www.banzaimusic.com/PEC-MIL-MO-REV-500k.html

Dear moamps,

That's  all I need!!....very well done pots not Chinase, look like sensitivity  turns-value
very presicion!!

I have contacted for anti-log taper custom made at least!

Thanks,
Opacheco

 

[gar381]

If all else fails  try State Potentiometer

http://www.potentiometers.com/seriesRV4.cfm

Very expensive for custom but they can make damn near
everything.

GARY