I have a buzz about half volume and up on channel a of my cs-800. Easy fix or should I trade it ? ALSO.... I have a cs-800 x1 crossover amp that I want to use as a regular power amp to run monitors thru. How can I get the 2 channels to work as a regular amp, do I need to bridge it, and if so how ? Where do inputs go ? patches ? I'm lost...
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Disconnect the input to the amp on the humming channel. If the hum still exists then there is probably a bias problem in the out put section. Check to see if there is a DC voltage on the speaker with no signal applied.
What you need to do is track down which part is getting the most hot. Then try replacing it. The best way is not to have it running to long. Then feel around (don't burn yourself) for the part that is generating the most heat. I suspect it will be transistor or IC that has developed a thermal fault.
2 Channel Peavey CS-800 Amp (800 Watts) ...Peavey CS-800x 800 Watt PA Stereo power Amplifier. The Part in question Q4025P is an alternistor. Two SCRs back to back that may have shorted out if it is not working.
If you are trying to use 3 amps to drive a single cabinet, it can not be done. Bridging amplifiers requires a specific circuit design for that application. There is no way to hook up multiple amps to a single speaker.
It's a log time ago that I repaired those amps., but I give it a shot.
There's a speakerprotection after the finals, what I remember it's a triac (SAC187, or something like that).
You will find it at a small pcb at the back of the amp. Normally it has three legs but the centre is cut away. If it's down you will measure 0 Ohm at the output, also with a switched off amp.
Thats all I can remember, it was about 25 years ago.
try the following:- go to (radio shack) near to you and obtain a good brand contact cleaner and apply spray over volume control while you are moving it forward and backward.-also try to unplug it from walloutlet and reinsert it again.-also confirm the cabels to speaker in good condition and no short circuit in it and nothing touch eash other.