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 11th April 2005, 06:40 AM   #1
diyAudio Member
 
Join Date: Apr 2005
Location: Ohio
Default Amp Crackle

I have a 120 watt crate amp. it recently started making crackle noises, and producing mass ammounts of fuzz when played with distortion. i have tried numerous chords, and guitars and the problem is still present. What should i do ?
  Reply With Quote
Old 11th April 2005, 12:20 PM   #2
diyAudio Member
 
tom daghdha's Avatar
 
Join Date: May 2004
Location: Liverpool / Leeds, UK
Does it crackle when you more the input jack, adjust a pot, or just when it's sat alone without you changing it?
  Reply With Quote
Old 12th April 2005, 04:59 AM   #3
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
Answer Tom's questions. Also, try probing every jack on it with a plug a couple times just to wake up the contact surfaces. A common problem is effects loop jack contacts. When you are NOT using the loop, there are contacts inside that carry the signal past them. Dirty contacts, crummy sound. Take a spare cord and plug one end into the effects send and the other end right back into the effects return. If it restores the sound, the return jack needs service. This will not harm the amp in any way.

Beyond all that, plug the guitar into the effects return or better yet the power amp in jack. Does the noise stop? If so, then the power amp is clean. You can also run a cord from the preamp out or effects send to another amp. If the noise is present int h eother amp, then the preamp is the source of the noise.

And it is always helpful when asking for assistance to tell us what model amp you have. My binders full of crate amplifier schematics take up a foot of shelf, plus the CD ROM ful of more. Narrow it down from the hundreds of choices, if you would.
  Reply With Quote
Old 22nd April 2005, 07:53 PM   #4
diyAudio Member
 
Join Date: Apr 2005
Location: So. Illinois
Default Crate crackle

I love it! Crate Crackle! Should be a breakfast cereal! Your problem is the common Crate speaker/headphone jack issue. The power to the speaker jack is interupted by the headphone jack when you plug in a headphone. These little pieces of crap need to be taken out or bypassed unless you use headphones on a regular basis. I have made many Crate owners quite happy when they bring their "not-repairable" amps in and get them back for a $20.00 repair bill. Marshall has the same problem on their low-end amps. While you are playing, plug a headphone into and then unplug a few times. You will find it changes the "crackle" each time you do. Now send me $20.00!
  Reply With Quote
Old 23rd April 2005, 02:51 AM   #5
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
Crate, Marshall, or anyone else using the normals inside the jacks to carry the signal are prone to this. In Crate amps I look to the efects loop first, but phones jack is certainly way up the kist on head that have them.

The CLiff style jacks Crate uses are easy to serviec though. I have a small burnisher (it is a GC 9337) that fits in the slot the contact lives in - about 1/8". Lift the contact and insert the burnisher, then release the contact onto it. Stroke the burnisher a couple times to polish the contact surfaces and like a miracle the jack is saved. They almost never come back after that. If they wwon't clean up in the first place, then we replace, but if it cleans, it usually stays working.

ANother favorite failure in Crates is the solder cracking on the large cement resistors.
  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
hk 770 snap crackle pop new_wes Solid State 1 23rd May 2010 07:13 AM
HOT ROD DELUXE: CRACKLE...POP...what to do? juicy1484 Tubes / Valves 17 29th April 2010 02:08 PM
Sub plate amp hum/crackle GhettoSQ Solid State 3 15th February 2007 03:35 PM
Crackle !! can't solve ?? titanchen68 Class D 29 7th May 2006 03:20 AM
Pop/crackle in one channel Saurav Tubes / Valves 16 28th November 2004 11:21 PM


New To Site? Need Help?

All times are GMT. The time now is 08:23 AM.


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