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

Headphone Systems Everything to do with Headphones

Stax pro SRD-7 hum
Stax pro SRD-7 hum
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 13th October 2015, 02:33 PM   #1
sfltrack is offline sfltrack  United States
diyAudio Member
 
Join Date: Dec 2009
Default Stax pro SRD-7 hum

I am getting a very low frequency hum in my Stax SRD-7 headphones. The frequency sounds much lower than 60hz. This is a recent development and I think my house's 110V power is dirty. There is no ground in the adapter's power supply cord. The HV supply in the adapter is a cap/diode ladder type so before I go to an isolation transformer, I was wondering if building a power supply DC filter would help?
  Reply With Quote
Old 21st October 2015, 12:48 PM   #2
sfltrack is offline sfltrack  United States
diyAudio Member
 
Join Date: Dec 2009
I bought a Tripplite isolation transformer on Ebay. Problem solved.
  Reply With Quote
Old 4th November 2015, 12:45 AM   #3
Struth is offline Struth  Canada
Banned
 
Join Date: Aug 2012
Location: books at londonpower.com
Hi Guys

The voltage multiplier effectively cuts the hum frequency by the number of stages of multiplication. It would seem that either a diode or a cap has failed in the supply - or more likely just a cold solder joint.

Resoldering every connection fixes most problems in most types of electronics device, so that would be the thing to do first. The caps in the Stax supplies are low-value and easy to replace if you have to.

The bias supplies I build use full-wave rectification and no doubling - just RC filters using Solen caps and metal-film resistors. Because the current is essentially zero and mpedances are very high, a few 1uF caps produces a dead quiet supply. The caps discharge almost immediately upon power-down.

Have fun
  Reply With Quote

Reply


Stax pro SRD-7 humHide 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
Unknown Stax Headphones for SRD-7 tiefbassuebertr Headphone Systems 1 1st November 2013 12:08 PM
2 x 5 Pro Stax female plugs MASantos Swap Meet 0 19th October 2012 01:10 PM
Adding a normal connection to SRD-7 Pro. piknik Headphone Systems 5 30th October 2011 06:13 AM
WTB Stax SRD 6 or thereabouts chargerpk Swap Meet 0 20th September 2011 09:23 AM
FS: Stax SR-Sigma and SRD-7 ($700) jacocb03 Swap Meet 3 5th March 2011 09:38 PM


New To Site? Need Help?

All times are GMT. The time now is 10:20 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki