intermitent static pops from speakers st70 - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

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

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 17th July 2010, 10:15 PM   #1
diyAudio Member
 
Join Date: Feb 2010
Location: calgary alberta tundra canada
Default intermitent static pops from speakers st70

hi,

i get intermitent static popping sounds from the speakers when i have the st70 plugged in. is it some bad solder joints? i dont think i had the problem when i first started listening to it.

any ideas?

thanks
  Reply With Quote
Old 17th July 2010, 10:54 PM   #2
20to20 is offline 20to20  United States
diyAudio Member
 
20to20's Avatar
 
Join Date: Jun 2010
Location: W-S, NC
That sounds typical of intermittent contacts with tube pins. A hissy pop. Wiggle the tubes a little and see if you get more or less. Be gentle on the board tubes so you don't crack any weak solder joints under those sockets. It could also be bad solder joints already on those, mimicking a dirty socket. Inspect those joints closly with a magnifying glass and reflow them if you have any doubts. I'd do that first just to eliminate any obvious bad joints. You will probably find some some wrinkley, dark, solder and that is usually the source of trouble and should be reflowed. Be quick and add a dab of new solder to help the old flow better. You could also be hearing noise from leaky caps reforming if this is an unused amp.

BTW, diytube.com has a dedicated st-70 section.

Last edited by 20to20; 17th July 2010 at 11:13 PM.
  Reply With Quote
Old 17th July 2010, 11:15 PM   #3
diyAudio Member
 
Join Date: Feb 2010
Location: calgary alberta tundra canada
Quote:
Originally Posted by 20to20 View Post
That sounds typical of intermittent contacts with tube pins. A hissy pop. Wiggle the tubes a little and see if you get more or less. Be gentle on the board tubes so you don't crack any weak solder joints under those sockets. It could also be bad solder joints already on those, mimicking a dirty socket. Inspect those joints closly with a magnifying glass and reflow them if you have any doubts. I'd do that first just to eliminate any obvious bad joints. You will probably find some some wrinkley, dark, solder and that is usually the source of trouble and should be reflowed. Be quick and add a dab of new solder to help the old flow better. You could also be hearing noise from leaky caps reforming if this is an unused amp.

thanks for the reply. ill reflow those joints. but now i have blown ANOTHER gz34. if i turn the amp off and on and dont wait for at least 30 seconds i blow a fuse and even then the rectifier gets damaged so that the next time it happens it is ruined and shorts out, sparks and dies. this is 3 rectifiers now! arrgh

any advice? sigh
  Reply With Quote
Old 17th July 2010, 11:32 PM   #4
diyAudio Member
 
Join Date: Apr 2003
Location: Portland,Oregon
Blog Entries: 4
Send a message via AIM to DigitalJunkie
advice? Don't turn it back on so soon!
Seriously,tubes don't like being re-energized when they're still warm..Wait a couple minutes for them to cool down before re-applying power.
  Reply With Quote
Old 17th July 2010, 11:37 PM   #5
diyAudio Member
 
Join Date: Feb 2010
Location: calgary alberta tundra canada
Quote:
Originally Posted by DigitalJunkie View Post
advice? Don't turn it back on so soon!
Seriously,tubes don't like being re-energized when they're still warm..Wait a couple minutes for them to cool down before re-applying power.
thanks a lot for that! at least i know what the problem is. now the popping noise.

thanks again!
  Reply With Quote
Old 18th July 2010, 01:05 AM   #6
chrish is offline chrish  Australia
diyAudio Member
 
chrish's Avatar
 
Join Date: Oct 2003
Location: Sydney
I have read that silicone diodes (eg UF4007) in series with the plates on the valve rectifier can help reduce the arcing/blowing. I did this on my latest project. There are generally plenty of spare pins on the socket to place the silicone diodes, so it is an easy mod.
  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
Speakers popping and static noise at all volume levels PPI Amp duderino201 Car Audio 21 8th May 2010 09:19 PM
Rogers pops, crackle and static are driving me mad! cr0wl3y Tubes / Valves 14 8th March 2010 11:23 AM
Mains pops and clicks markiemrboo Chip Amps 10 9th September 2007 09:57 AM
Amp pops on power down? jjai Instruments and Amps 2 8th March 2005 08:26 PM
Static in my screen make sound in my speakers :( Guss Everything Else 4 7th March 2004 11:21 PM


New To Site? Need Help?

All times are GMT. The time now is 05:30 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