noisy amp problem.. driving me crazy - Jemsite
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post #1 of 6 (permalink) Old 02-29-2004, 12:20 PM Thread Starter
Join Date: Aug 2003
Location: PA
Posts: 873
noisy amp problem.. driving me crazy

ok guys.. i put new power tubes in the amp sounds much better.. my tone has improved dramatically.. but after about say 20 minutes of playing i still get this bad crackle in the speaker.. doesn't matter how loud the amp is set. it's always the same crackle at any volume. it's not constant. it happens about every 2 seconds for just a a split second. i looked at the tubes i just put in.. they are fine. the preamp tubes are all lit.. not glowing red like some have said can be a sign for bad ones. it seems to me that if i turned the amp volume all the way down that sound would stop.. but it's not.. any idea??? speaker problems?? interference in the wire from the preamp to the speaker. help me out.. i wanna sell the thing and i want no problems with it when i sell it.. thanks guys
adamcbest is offline  
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post #2 of 6 (permalink) Old 02-29-2004, 01:00 PM
Join Date: Jan 2004
Posts: 197
sounds like maybe a bad preamp tube.....
honky_tonk is offline  
post #3 of 6 (permalink) Old 02-29-2004, 01:33 PM
Join Date: Dec 2003
Posts: 395
Try new cables they might be duds

If not, when you installed the tubes did you knock anything loose?

It could be a number of things so it is hard to say. What preamp tubes do you have and how long have they been in there?

power freak is offline  
post #4 of 6 (permalink) Old 03-02-2004, 05:54 AM
Join Date: Feb 2004
Posts: 73
what sort of amp is it?

it sounds a bit like the problem I had with my Marshall JCM2000 DSL100 Head the first time around
Joshka is offline  
post #5 of 6 (permalink) Old 03-02-2004, 05:56 AM
Join Date: Feb 2004
Posts: 73
is it a soft/smooth crackle (as in , not a violent crackle)? and also, do you find you are getting volume swelling?

when your playing loud, do you find after a short while that the volume may get louder and then softer?
Joshka is offline  
post #6 of 6 (permalink) Old 03-03-2004, 10:50 AM Thread Starter
Join Date: Aug 2003
Location: PA
Posts: 873
apparantly i left the amp model out.. I have a JCM 2000 TSL 601. So Joshka, could be the same kinda problem. it's violent yes. not very loud.. but all of a sudden it will go kkkkkk.. for a split second, then about 3 or 4 seconds later it will happen again. but it takes about 20- 30 mintues of playign before it starts doing this. i haven't had it extremekly loud lately since i have been playign in my dorm room, but i haven't noticed any volume swelling. any ideas??
adamcbest is offline  

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