Go Back   Home > Forums > >

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

Doug Self Preamp from Linear Audio #5
Doug Self Preamp from Linear Audio #5
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
Old 21st September 2020, 08:55 PM   #1541
tomi2251 is offline tomi2251  Norway
diyAudio Member
 
Join Date: Aug 2005
i go trough the scematic and look over my psb cant find any fault.
i took some pictures.
if someone has any ideas what i can do i would be happy.
ps its the left channal that is low volume, i turn the balance all the way to left to get equal signal...but i cant use tone controll because off the whining noise.Click the image to open in full size.
__________________
Tomi
  Reply With Quote
Old 21st September 2020, 09:07 PM   #1542
tomi2251 is offline tomi2251  Norway
diyAudio Member
 
Join Date: Aug 2005
Dropbox - preamp - Simplify your life
__________________
Tomi
  Reply With Quote
Old 21st September 2020, 11:48 PM   #1543
jwilhelm is offline jwilhelm  Canada
diyAudio Member
 
Join Date: Jun 2014
Location: New Hamburg, Ontario
Does it make any difference if you flip the tone bypass switch?
__________________
https://www.vzaudio.com/
  Reply With Quote
Old 22nd September 2020, 08:37 PM   #1544
Freecrowder is offline Freecrowder  United States
diyAudio Member
 
Join Date: Jun 2007
Dont want to intrude on trouble shooting issues but this is the right place to post. Maybe I can help on TS also. Finally got around to putting into proper case. If anyone needs FPD files that work I can supply. I offboarded volume pot and changed lettering from Carls files. Kind of a throwback to the 1U pres from the 80's and 90's
Attached Images
File Type: jpg IMG_0202.jpg (26.2 KB, 128 views)
File Type: jpg IMG_0199.jpg (33.3 KB, 169 views)
File Type: jpg IMG_0200.jpg (40.1 KB, 192 views)
  Reply With Quote
Old 22nd September 2020, 08:38 PM   #1545
Freecrowder is offline Freecrowder  United States
diyAudio Member
 
Join Date: Jun 2007
Kind of small for any detail. let me know if anyone wants to see more detail.
  Reply With Quote
Old 22nd September 2020, 08:53 PM   #1546
Freecrowder is offline Freecrowder  United States
diyAudio Member
 
Join Date: Jun 2007
Tommi,
BTW did you build up your own ribbon cables? I had the most issues with cabling getting PIN for PIN matchup and the selector switch with the ribbon connector header pin 1 pinout. Look that over carefully took me 2-3 times to get everything just right.
  Reply With Quote
Old 22nd September 2020, 09:05 PM   #1547
tomi2251 is offline tomi2251  Norway
diyAudio Member
 
Join Date: Aug 2005
Hi
Yes its difference when i move The tone contrll, The biggest difference its The treble range its start to feed... Like feedback from a mic to loudspeaker.
I buy standard ribbon cable ready with contacts
__________________
Tomi
  Reply With Quote
Old 22nd September 2020, 09:12 PM   #1548
Freecrowder is offline Freecrowder  United States
diyAudio Member
 
Join Date: Jun 2007
So are you saying that with the tone control switch in it has feedback and when it is out it doesn't?? Important to completely understand the symptoms
  Reply With Quote
Old 23rd September 2020, 09:25 PM   #1549
tomi2251 is offline tomi2251  Norway
diyAudio Member
 
Join Date: Aug 2005
Yes IF I turn it off or turn down to lowest on The treble scale its get less and disapear.
But with out tone contrll its sounds good
Just That The left channal its half The output
__________________
Tomi
  Reply With Quote
Old 23rd September 2020, 09:32 PM   #1550
jwilhelm is offline jwilhelm  Canada
diyAudio Member
 
Join Date: Jun 2014
Location: New Hamburg, Ontario
To try to narrow down where the issue is, remove A4 and see if the volume is louder with the tone control switch in bypass. Do the same with A3 removed.
__________________
https://www.vzaudio.com/
  Reply With Quote

Reply


Doug Self Preamp from Linear Audio #5Hide this!Advertise here!
Thread Tools

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Doug Self Elektor phono preamp: SA1085 substitute? tcpip Analogue Source 10 30th March 2021 06:09 PM
Doug Self's New Preamp Construction and Pictures redjr Analogue Source 190 30th May 2018 06:34 AM
What does preamp PSU oscillation look like for linear regulators? shredhead Power Supplies 59 28th March 2015 09:16 PM
OLDSCHOOL CAR AUDIO-ORION/US AMPS/LINEAR POWER/PLANET AUDIO TUBES NIB mclsound Swap Meet 7 26th July 2013 10:10 AM
4th Ed. of Audio Power Amplifier Design Handbook (Doug Self) nickds1 Solid State 4 9th November 2006 12:02 PM


New To Site? Need Help?

All times are GMT. The time now is 11:55 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki