Are these pots what I need for my preamp? - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 16th January 2013, 11:39 AM   #1
mortron is offline mortron  Canada
diyAudio Member
 
Join Date: Aug 2011
Location: Town
Default 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?
  Reply With Quote
Old 16th January 2013, 03:01 PM   #2
diyAudio Member
 
Join Date: Nov 2008
The listing was removed....
  Reply With Quote
Old 16th January 2013, 03:15 PM   #3
diyAudio Member
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Send a message via Skype™ to JonSnell Electronic
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.
  Reply With Quote
Old 16th January 2013, 07:52 PM   #4
mortron is offline mortron  Canada
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.
  Reply With Quote
Old 16th January 2013, 08:06 PM   #5
sreten is offline sreten  United Kingdom
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.
  Reply With Quote
Old 16th January 2013, 09:07 PM   #6
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
  Reply With Quote
Old 16th January 2013, 09:25 PM   #7
sreten is offline sreten  United Kingdom
diyAudio Member
 
Join Date: Nov 2003
Location: Brighton UK
Click the image to open in full size.

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
  Reply With Quote
Old 16th January 2013, 11:44 PM   #8
diyAudio Member
 
Join Date: Nov 2008
Pix of different controls. Which is what you get? E
  Reply With Quote
Old 17th January 2013, 03:05 AM   #9
mortron is offline mortron  Canada
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?
  Reply With Quote
Old 17th January 2013, 02:25 PM   #10
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.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
experimental ganged pots on preamp cyclecamper Instruments and Amps 8 12th December 2012 03:34 AM
FS: volume pots with bass tap and other pots flatheadmurre Swap Meet 0 3rd August 2012 06:12 PM
Digital pots, better or worse than analogue pots ? nigelwright7557 Parts 8 25th October 2011 05:10 PM
Sliding Pots vs Circular Pots for an equalizer inverseopamp Digital Line Level 13 27th April 2011 07:31 PM
Trimmer pots for onboard guitar preamp tone controls? Tech Analog Line Level 2 19th September 2009 03:17 PM


New To Site? Need Help?

All times are GMT. The time now is 05:12 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2