Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

tube buffer noise cancellation
tube buffer noise cancellation
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 7th April 2012, 12:10 AM   #1
speakerfritz is offline speakerfritz  United States
diyAudio Member
 
Join Date: Jul 2008
Default tube buffer noise cancellation

just kicking this around for ideas. My amps and DAC have both RCA and XLR. Right now Im running DAC>tube buffer>amp via RCA. I have two tube buffers which are identical. Was thinking of taking two XLR to Dual RCA cable and setting up each tube buffer to handle the inverted and non inverted signals of one channel. So one box per channel. Power supply is common in the tube buffer. I'm wondering if using the buffers in this manner would cancel out remaining background noise in as much as noise is cancelled out in P-P circuts of amp output stages.
Attached Images
File Type: gif zkit4schematic.gif (5.2 KB, 143 views)
File Type: gif zkit5schematica.gif (6.9 KB, 140 views)
  Reply With Quote
Old 7th April 2012, 03:20 AM   #2
DualTriode is offline DualTriode  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Sacramento
Tell us more about the noise? Where is it coming from? If you run the system with the buffer removed does the noise go away?
Typically Solid State stuff has the advantage of being quiet to the point you do not hear it! For noise cancelation the noise needs to be common.
My recommendation is to minimize the noise before you go to the effort and complexity of your proposed balances circuit. Or jump in to do it for fun.
DT
  Reply With Quote
Old 7th April 2012, 06:04 AM   #3
TonyTecson is offline TonyTecson  Philippines
diyAudio Moderator
 
TonyTecson's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
tube buffer noise cancellation
perhaps an ltp stage instead?
__________________
planet10 needs your help: Let's help Ruth and Dave...http://www.diyaudio.com/forums/plane...ml#post5010547[B
  Reply With Quote
Old 7th April 2012, 02:59 PM   #4
speakerfritz is offline speakerfritz  United States
diyAudio Member
 
Join Date: Jul 2008
I got rid of most of the noise by implementing a suggestion from a fellow forum member which was to ground pin 9 of the tube. Prior to that , the noise was objectionable. Now, the noise is very faint during quiet passages while playing at moderate sound levels. The circut uses AC heaters. Rather than convert to DC heaters, install chokes in the PS, add OC2 type tubes, and fine tune capacitors, I was thinking I could kill two birds with one stone....patch cord for XLR and cancel out remaining power supply based back ground noise.
  Reply With Quote
Old 7th April 2012, 10:36 PM   #5
TonyTecson is offline TonyTecson  Philippines
diyAudio Moderator
 
TonyTecson's Avatar
 
Join Date: May 2003
Location: Palatiw, Pasig City
tube buffer noise cancellation
biasing the filaments with dc, 1/4 of B+ worked for me all the time, geting rid of hum and noise.......
__________________
planet10 needs your help: Let's help Ruth and Dave...http://www.diyaudio.com/forums/plane...ml#post5010547[B
  Reply With Quote

Reply


tube buffer noise cancellationHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
software noise cancellation / antisound jackpipe Digital Line Level 14 8th April 2017 11:01 AM
Active noise cancellation for a computer? MikeHunt79 Everything Else 0 3rd April 2008 10:54 PM
Active Noise Cancellation gcladis Pass Labs 4 27th June 2006 11:36 PM
Active Noise Cancellation manse Everything Else 7 31st March 2003 04:57 PM


New To Site? Need Help?

All times are GMT. The time now is 05:08 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki