Are these pots what I need for my preamp?

mortron · 16th January 2013, 11:39 AM

I have been eyeing up some of these pots on that site:

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... TQ:US:1123

and was curious if the attenuation curve for the pot would be too steep or anything like that. I use a 100k pot in my preamp now and use about half of the travel for regular listening levels currently, but most amps I have are variable input, as I am running efficient speakers and only have bigger power amps (200W and 380W per channel @ 8 ohms). I plan on running this before my active crossover. Thanks

It starts at -60Db, and the steps are roughly -53, -46, -40, -36, -31, and so on... the increments become finer towards the end... is this initial start too steep?

mickeymoose · 16th January 2013, 03:01 PM

The listing was removed....

Harleyjon · 16th January 2013, 03:15 PM

The increments show the pot to be logarithmic, which suits the human ear as our perception of sound levels is the same.
3dB rise is twice as much power, so -60dB would represent quiet and 0dB full volume.

mortron · 16th January 2013, 07:52 PM

Apologies... Here it is:

Dact Type 21 Stepped Attenuator Potentiometer 100K 2A3 | eBay

The curve is very different from one end to another, as it appeals the steps become smaller increments. Is there a way to wire it in reverse?

He provided a graph but I am unable to save and attach.

sreten · 08:17 PM

Hi,

Wiring in reverse is easy, but totally useless for a log law.

No control at low volumes, and next to no effect at high volumes.

rgds, sreten.

mickeymoose · 16th January 2013, 09:07 PM

To me this looks like a standard pot with mechanical click-stops, not individual resistor elements between stops.
The return policy, sort off, says it all! E

sreten · 16th January 2013, 09:25 PM

Hi, It clearly isn't a standard pot with clickstops, rgds, sreten.

mickeymoose · 16th January 2013, 11:44 PM

Pix of different controls. Which is what you get? E

mortron · 17th January 2013, 03:05 AM

Hmmm. So I am looking for an affordable stepped attenuator to replace my volume pot on my preamp. I apologize for using the wrong terminology. Is there another suggestion you could make?

mickeymoose · 02:52 PM

The ALPS Blue Velvet, series RK27, is not a stepped attenuator, but of high quality. Search this forum, there are several discussions here. E

16th January 2013, 11:39 AM	#1
mortron diyAudio Member Join Date: Aug 2011 Location: Town	Are these pots what I need for my preamp? I have been eyeing up some of these pots on that site: http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... TQ:US:1123 and was curious if the attenuation curve for the pot would be too steep or anything like that. I use a 100k pot in my preamp now and use about half of the travel for regular listening levels currently, but most amps I have are variable input, as I am running efficient speakers and only have bigger power amps (200W and 380W per channel @ 8 ohms). I plan on running this before my active crossover. Thanks It starts at -60Db, and the steps are roughly -53, -46, -40, -36, -31, and so on... the increments become finer towards the end... is this initial start too steep?

16th January 2013, 08:06 PM	#5
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Wiring in reverse is easy, but totally useless for a log law. No control at low volumes, and next to no effect at high volumes. rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow Last edited by sreten; 16th January 2013 at 08:17 PM.

16th January 2013, 09:25 PM	#7
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, It clearly isn't a standard pot with clickstops, rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

17th January 2013, 02:25 PM	#10
mickeymoose diyAudio Member Join Date: Nov 2008	The ALPS Blue Velvet, series RK27, is not a stepped attenuator, but of high quality. Search this forum, there are several discussions here. E Last edited by mickeymoose; 17th January 2013 at 02:52 PM.

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16th January 2013, 03:01 PM	#2
mickeymoose diyAudio Member Join Date: Nov 2008	The listing was removed....

16th January 2013, 03:15 PM	#3
Harleyjon diyAudio Member Join Date: Dec 2012 Location: England	The increments show the pot to be logarithmic, which suits the human ear as our perception of sound levels is the same. 3dB rise is twice as much power, so -60dB would represent quiet and 0dB full volume.

16th January 2013, 07:52 PM	#4
mortron diyAudio Member Join Date: Aug 2011 Location: Town	Apologies... Here it is: Dact Type 21 Stepped Attenuator Potentiometer 100K 2A3 \| eBay The curve is very different from one end to another, as it appeals the steps become smaller increments. Is there a way to wire it in reverse? He provided a graph but I am unable to save and attach.

16th January 2013, 09:07 PM	#6
mickeymoose diyAudio Member Join Date: Nov 2008	To me this looks like a standard pot with mechanical click-stops, not individual resistor elements between stops. The return policy, sort off, says it all! E

16th January 2013, 11:44 PM	#8
mickeymoose diyAudio Member Join Date: Nov 2008	Pix of different controls. Which is what you get? E

17th January 2013, 03:05 AM	#9
mortron diyAudio Member Join Date: Aug 2011 Location: Town	Hmmm. So I am looking for an affordable stepped attenuator to replace my volume pot on my preamp. I apologize for using the wrong terminology. Is there another suggestion you could make?

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