Scratchy sound - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

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 4th September 2011, 09:28 PM   #1
diyAudio Member
 
Join Date: Sep 2011
Default Scratchy sound

Hello,

I just tried posting this same question a few minutes ago, and even though it appeared to be submitted, it's not showing up in the threads. If it pops up twice, I apologize.

Okay, having a problem with my Peavey Classic 50 Head. I'm getting a strange, scratchy, distorted sound when I play low notes or chords. Sounds the way a scratchy potentiometer would sound. Happens on both the clean and dirty channels. I have replaced all the tubes and the problem persist. Any ideas?

Thanks-
Jim
  Reply With Quote
Old 4th September 2011, 09:42 PM   #2
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Blog Entries: 8
Sounds like the speaker may be knackered. Can you test the amplifier with a different cabinet?
__________________
"Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo
My setup: http://www.diyaudio.com/forums/multi...tang-band.html
  Reply With Quote
Old 4th September 2011, 09:44 PM   #3
diyAudio Member
 
Join Date: Sep 2004
Location: Minneapolis, Minnesota, USA
Loose tube socket contacts?

Mike
  Reply With Quote
Old 5th September 2011, 01:29 AM   #4
diyAudio Member
 
Join Date: Apr 2010
Could be a dirty pot and the low notes vibrate the wiper. If it does it when the amp is played quietly then it sounds like maybe a coupling cap leaking DC?
  Reply With Quote
Old 5th September 2011, 02:58 PM   #5
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
Tube amps are rather dangerous. You need to read the hv thread for newbies at the head of the tube forum, or aikenamps.com technical resources button, technician safety button. You probably have a loose connection, either a potentiometer, or something else. Poking around at things with a plastic stick or a dry wooden dowel, to see if the scratch is located a particular place, would probably be safe. If it is a potentiometer, try spraying it out before replacing it. Aliphatic hydrocarbon contact cleaner from the lumberyard is highly flammable, no smoking, open flame or pilot lights, electricity turned on or off within 30' of the spray. Non-flammable contact cleaner from the electrical supply house (contains brominated or florinated hydrocarbons) dissolves PVC plastic contained in consumer devices.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300
  Reply With Quote
Old 6th September 2011, 01:28 AM   #6
diyAudio Member
 
Join Date: Sep 2011
Thanks for all the advice. I'll see what I can come up with and post back.
  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
Scratchy sound Clubman35 Instruments and Amps 0 4th September 2011 09:18 PM
Mission 770 scratchy sound Christowp Multi-Way 8 8th July 2011 11:19 AM
Scratchy Woofer..... pertree Multi-Way 1 20th March 2010 12:20 AM
problem - scratchy sound, rythmical adamus Tubes / Valves 10 15th October 2009 08:13 PM
Why does my tube amp make a scratchy, popping sound? longdrive55 Tubes / Valves 12 11th August 2009 06:48 PM


New To Site? Need Help?

All times are GMT. The time now is 09:24 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