Hi people, i've got a bad problem with my amp, and i was hoping you guys could help me out !
I've got a Peavey PV 500 power amplifier ( 2 * 250 watts) which i use to gig with in pubs and stuff. The things got a built in cooling fan which turns on when its used at high volumes and off when things go quiet ( ie in between songs ) The problem is that it gives out a 'Click' eack time it switches on or off and at high volumes it becomes a massive 'CRACK' thats gonna knacker my speakers if it goes on much longer. I used to have a set of Peavey speakers that were already knackered anyway so i was never too bothered about it until now as i have purchaced a new set of Soundlab speakers which are great and i really need to keep them that way. The crack now sounds ten times louder than it used too.
I used to do electronics at college about ten years ago and i remember a theory of placing a Capacitor across a component to stop spiking occuring. Does anybody know if this will work or have any other theories to solve the problem as i'm now afraid of using the speakers at high vols, which means i cant take them out to gig with.
I would really appreciate your opinions on this as im stuffed without them.
Cheers.
K
If this is a straght amp or a powered mixer?
Its a straight Amp, Takes up 3 rack spaces in my rack box. 'Bout 6 inches high. Just an on switch , a reset switch and two output knobs, one for each channel on the back. Over ten years old.
Ok If its popping when its turned on, the speaker relay is stuck closed or the relay circuit ,like the driver transistor is shorted that switches the relay on, and goes on when power is applyed. On any amp this big, theres always a relay delay to turn on the speakers so you don't pop the spiders and dislocate the voice coils. Good Luck
I may have explained that a bit wrong mate. It's the actual fan switching after the amp has been running for a while - say ten minutes after switching the amp on that creates the crack. The fan runs constantly, and operates at low speed when the amp isn't doing much. When a song is played at loud volume levels, the amp heats up a bit and the fan then switches to high speed to cool itself down.When i finish a song or stop playing for a while, the amp then switches back to low speed. It's this switching speeds that creates the cracks. As you can imagine , thats a lot of cracks at high volume every gig. Got any ideas.?
p.s Thanks for replying.
K