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It could be just a lead, check your lead heads and inserts are clean.
Check along your leads and wires for any obvious kinks / tight bends / cuts / nicks / something sitting down on it or any damage to the wires.
It could be just the dials / knobs need taking off and cleaning in behind. the pickups, you may not need to remove them just spray with electronic cleaner this stuff is great for lots of differnts electrical cleaning problems.
yeah ,, the circuit controllong your volume controll.. the popping sound occurs when it just shorts out and when its totally shorted the volume drops and rises..
If you got eletronic experience you can
1.) open it up
2) look for a cracked circuit or broken solder if so re solder it
3.) test the capicators and resistors and transistors for a bad one ( a tran sistor was bad in mine)
4) check the ic for it being bad or loosing connectativity or if its defective...
More than likely it will be a transistor cause if it was any other part it would have not layed at all.. the ic can also cause it..
If you have any eletricial experience or a multimeter to follow the above instructions, take it to a technician..
It does sound like your speakers. But it could be the output transistor are going bad. As you increase the volume causing more current to go thru them it make a clipping sound. If you have a different set of speaker try and see if the popping is replicated. If not have some check your receiver out.
I Think that something like a transistor is getting hot and then shutting down. Exploring inside might solve the problem of what's getting really hot. You could even get some Servisol Freeze Spray, and wait for it to go off then spray it on the suspected part. That will cool it down and it should start up again. If it does come on, that part will have to be replaced.
Well it sounds like your amplifier IC's are working correctly since you are hearing that pop. I have the same amplifier and every 10db increment it pops. Have you tried every input? Possibly try starting at a low volume, plug an RCA plug into CD or any other input, and touch the center prong of the other end of the cable. You should get a 60hz hum if your in the USA, otherwise it will be 50-55hz. Regardless it should make noise.
I've never repaired one of these but I have an amp at home that makes a intermittent static "popping" noise that i'm going to put down to a dirty volume pot (control) that needs cleaning. I will also have to change some of the electro capacitors that have dried up inside which cause "shot noise". With the right lubricant (electrical contact cleaner, nothing else) you could take to lid off and spray a small 1 second blast into the hole of the pot and any other balance or tone control yourself but I would take it to the electronics repairer to get the capacitors checked over. My theory only Good Luck!
i have three of these in my amp repair shop. one of them does exactly this. as well, the other two are suspect to the same issue. i believe it is low quality leaky or shorting caps. are you using the xlr inputs or 1/4 inch inputs? so far, these are working good thru the 1/4 inch jacks, but the xlr inputs are squeely with feedback and i get that loud bang/pop from one of them. kustom wants me (my shop) to be an authorized repair station for them. i want to be able to resolve these three amps before i accept. if they are a nightmare to deal with, then i will tell them no way. i will post back with in the next week with more results and hopefully i will have precise solution with parts and procedures. yost amplifier repair yostamplifier.com
These units are capacitor coupled between stages. It sound to me like one or more of those caps are defective. There is an extra stage of amplification for the Phono inputs. Check the phono pre-amp section for defective caps.