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Snap, crackle, pop on starup..

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Posted on January 18, 2015 at 14:12:26
sanman
Audiophile

Posts: 1780
Location: Redwood Coast
Joined: November 13, 2004
 Of my Sansui au7700 intergrated amp. Also seems a bit distorted in higher volumes..my WAG is failing output transistors? Time for a repair?
"When the demon is at your door, in the mornin' it won't be there no more"
Steely Dan

 

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RE: Snap, crackle, pop on starup.., posted on January 19, 2015 at 07:44:23
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 Transistors are more like an ON/OFF switch. they either work or they don't. Your problem is elsewhere. More like old failing caps or resistors going "south" when they heat up.

charles

 

+1 n/t, posted on January 19, 2015 at 10:54:28
Awe-d-o-file
Dealer

Posts: 21037
Location: 50 miles west of DC
Joined: January 10, 2004
ET

"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936

 

RE: Snap, crackle, pop on starup.., posted on January 20, 2015 at 09:22:21
Hornlover
Manufacturer

Posts: 2529
Joined: March 8, 2002
 Sounds more like a cap problem to me. Scope the signal from input to output after every active device, and see where the noise shows up, then check any electrolytic you find in that area.

 

RE: Snap, crackle, pop on starup.., posted on January 23, 2015 at 09:40:08
Sherwood Forest
Audiophile

Posts: 240
Joined: October 7, 2014
 Totally agree with that advice, I'd just add that sometimes a careful visual inspection will reveal that a cap has leaked its goo or is bulging. Sometimes a very careful visual inspection will save you tons of time measuring and probing around.

Also, check all your supply voltages and make sure they're correct.

 

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