Anthem Pre 2L: Potentiometer - 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 27th May 2010, 04:29 PM   #1
markmay is offline markmay  United States
diyAudio Member
 
Join Date: Feb 2010
Default Anthem Pre 2L: Potentiometer

I am having a problem with the replacement of the potentiometer in my Anthem preamp.
I have replaced the volume control pot with an Alps RK27112 100K blue velvet. This is the same pot value that was in the Anthem from the factory.
My problem is that I get about 90% of the volume when it's only turned up to about 5% of the pot rotation travel.
Should I consider a pot with a different resistance value?
I have switched the gain selector to lowest level (8db).
Any suggestions would be appreciated.
  Reply With Quote
Old 27th May 2010, 05:37 PM   #2
diyAudio Member
 
eclectic2k's Avatar
 
Join Date: Nov 2005
Location: Silicon Valley
Quote:
Originally Posted by markmay View Post
My problem is that I get about 90% of the volume when it's only turned up to about 5% of the pot rotation travel.
assuming nothing is mis-wired...
it sounds like you have used a linear taper pot in place of what should have been an audio taper (log)

take a look at the RK271 spec sheet for the details and a nice graph of travel vs output. (or just do some googling) The taper is denoted in the full part number of the pot if you have it handy. (refer back to the spec sheet for the numbering system)

With a few extra resistors to form a sort of extra voltage divider you can make the lineartaper approximate log taper, or you can buy a new pot.

-CK
  Reply With Quote
Old 27th May 2010, 10:41 PM   #3
markmay is offline markmay  United States
diyAudio Member
 
Join Date: Feb 2010
CK,
Thanks for the info.
I looked at the specs and it is an audio log taper pot, however it does seem to taper more like a linear pot. The factory pot was guilty of similar performance, but not as bad. Will the resistor application work on a log taper pot? What do you think about channel bleed over, since both of the outputs would now be connected so close to the ground. Would the current prevent the bleed.
Thanks,
markmay
  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
Electrocompaniet or Anthem? philmagnotta Solid State 0 25th April 2010 09:43 PM
Anthem Amp 2 debugging help ronenash Solid State 20 23rd April 2010 02:09 PM
Understanding Anthem Amp2 output circuit ronenash Solid State 5 1st April 2010 02:16 PM
Anthem Integrated 1 Tube_Dude Tubes / Valves 9 19th June 2007 06:13 PM
cerwin vega pam 1.2L karma Multi-Way 1 9th April 2003 02:06 AM


New To Site? Need Help?

All times are GMT. The time now is 04:46 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