Popping noise? (video)

[Bassin Buick]

Got a weird pop at turn on. Only on my mid amp. Any ideas? Sometimes it happens and sometimes it doesn't. Here is a video where it does it , then next time it doesn't. http://i1105.photobucket.com/albums/h359/stanky1219/6412444f.mp4

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[akheathen Premium Member]

first thing, i would switch rcas with another amp, and see if it's the output on the hu..... what amp is it? is it something that just started with the amp? could be a number of things. the pop when starting after a resting period comes from a circuit charging up......

 

[Bassin Buick]

its not the RCA's on the HU. it did it on the ES deck as well. Its a usx-4065 thats popping.

 

[Shinju 10+ year member]

Amp has a bad cap or a resistor in the turn on circut going out.

 

[akheathen Premium Member]

well, other than checking your rcas and grounds, it sounds like the anti-thump circuit is fail. if it's still under warrenty, you could send it back, otherwise, check the caps, and look for dry connections on the board.

 

[Bassin Buick]

Amp has a bad cap or a resistor in the turn on circut going out.

Could be. I had to repair this one , i got it with a bad gate resistor and a burnt set of output finals. replaced the parts and it works great. Just has the pop. But i didnt check the caps , no leaks that i seen though. 

---------- Post added at 05:37 AM ---------- Previous post was at 05:36 AM ----------

 

well, other than checking your rcas and grounds, it sounds like the anti-thump circuit is fail. if it's still under warrenty, you could send it back, otherwise, check the caps, and look for dry connections on the board.

amp was made almost 10 years ago. LOL. and all my connections are fine. Its more than likely something internal.

 

[akheathen Premium Member]

hey sinju- you still got that malibu100 kickin around?

 

[Bassin Buick]

hey shinju , there was one more resistor i had to replace , the original (checked the good ones on the non failed channels) was a 620 ohm 1/2 watt resistor , i bought some off ebay and they read 617 ohms. Maybe take that back out and find one thats exactly 620 ohms? Also i think the tolerance is worse on the resistors i bought. The gate resistor i replaced came out of a dead PPI , it reads perfect , identical to the originals , but the 620 ohm resistor is definetly not as high quality as the original. umm..........oh , the finals i put in were exact matches from the original manufacturer.

 

[Bassin Buick]

and upon further testing , its coming from the channel i worked on. //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif