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

Elekit News and products from Elekit

Thread Tools Search this Thread
Old 25th June 2018, 04:38 AM   #1
ShortAS is offline ShortAS  United States
diyAudio Member
Join Date: Jun 2018
Default Crackling static noise in amp

About every 7-19 minutes I'm getting crackling static noise in both channels. I'm using shielded cable. I can't generate noise by turning lights on and off. Amp is dead quiet otherwise. 100% not from tubes. This is an Elekit TU-882 headphone amp. Just two tubes and output transformers. It has a fet in the PS that I changed to a higher voltage and current device. I was told if it would make any noise it would be hum. No hum, dead quiet until the crackle static storms come. I'm near certain that vol. control does not effect it but might check this a bit more. This is a problem with the amp. So it's unlikely it"s a new fet which is rated at 17.5 A and 950V compared to like 2.5a and 600v in the original or the replacement for the original??, maybe a cap?? I'm pretty careful to prevent cold joints. As per permission from the designer I took the input coupling cap out. Can't see why that would be a problem. Also put Elna Silmics in as cathode bypass. Here I go again with an intermittent problem. I got similar noise out of the amp that was caused by a bad impedance switch which was causing real bad noise. I sprayed the switch and can no longer cause crackling by moving the switch like before. All external connection are tight. What to do now?? Thanks
  Reply With Quote
Old 29th June 2018, 12:08 AM   #2
jhedlind22 is offline jhedlind22
diyAudio Member
Join Date: Jun 2018
Do you have a Spectrum Analyzer? I learned a real neat trick for hunting noise on a board with one. It might be harder if it is intermittent, but would still work.
  Reply With Quote
Old 29th June 2018, 02:27 AM   #3
rayma is offline rayma  United States
diyAudio Member
Join Date: Apr 2011
Originally Posted by ShortAS View Post
I'm getting crackling static noise in both channels.
Are the noises identical in both channels, or are they different?
If they are identical, it would have to be related to the power supply.
Can you sketch a schematic of the power supply?

Last edited by rayma; 29th June 2018 at 02:33 AM.
  Reply With Quote


Crackling static noise in ampHide 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
Jungson JA-88D crackling and static fixed! chillysalsa Solid State 9 13th January 2019 03:12 PM
Crackling noise.... pls help on Pre-amp tony Ma Tubes / Valves 5 9th April 2013 06:28 AM
Help with crackling noise Free0 Digital Source 0 15th June 2004 02:37 AM
Crackling/Static on my GC. azira Chip Amps 2 25th May 2004 10:48 PM
Crackling/static noise from CD63ki SimontY Digital Source 5 3rd August 2003 10:23 PM

New To Site? Need Help?

All times are GMT. The time now is 01:50 PM.

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