B1 Buffer Preamp - Page 377 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 28th June 2013, 11:44 AM   #3761
diyAudio Member
 
Join Date: May 2009
Location: Berlin
Any more suggestions what I can do about would be great
  Reply With Quote
Old 28th June 2013, 12:06 PM   #3762
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
Silly question but have you got the volume pot connected correctly.
  Reply With Quote
Old 28th June 2013, 12:07 PM   #3763
diyAudio Member
 
Join Date: May 2009
Location: Berlin
Thanks for your input

Yes pot is correct connected. If I dont put the pot but only the 1k resistor I also have the high frequencies damped
  Reply With Quote
Old 28th June 2013, 12:09 PM   #3764
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
It does look as though you have managed to make a variable filter at the input to the B1. Try increasing the size of the input caps.
  Reply With Quote
Old 28th June 2013, 12:11 PM   #3765
diyAudio Member
 
Join Date: May 2009
Location: Berlin
Hahah, you´re right.
  Reply With Quote
Old 28th June 2013, 12:15 PM   #3766
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
What was wrong ??
  Reply With Quote
Old 28th June 2013, 12:17 PM   #3767
diyAudio Member
 
Join Date: May 2009
Location: Berlin
I still dont know what is wrong. My input cap is a Solen 1uf. I can put in a higher cap and report back
  Reply With Quote
Old 28th June 2013, 12:21 PM   #3768
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
1uF should be fine. Are you sure its 1uF and not a fake - incorrectly labelled. If the cap is good and the pot is correctly wired you might have an impedance mismatch with your source. IE the frequency attenuation might be being caused by the volume control interacting with the output cap of your source.

Last edited by KatieandDad; 28th June 2013 at 12:23 PM.
  Reply With Quote
Old 28th June 2013, 12:23 PM   #3769
diyAudio Member
 
Join Date: May 2009
Location: Berlin
The Solen is from a very good seller Tubetown. Also I measured it before...
  Reply With Quote
Old 28th June 2013, 12:24 PM   #3770
diyAudio Member
 
KatieandDad's Avatar
 
Join Date: Nov 2011
Location: UK
What is the output impedance of your source ?
  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
buffer/preamp? TheDriver41 Chip Amps 2 3rd October 2004 08:40 AM


New To Site? Need Help?

All times are GMT. The time now is 06:59 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