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Old 24th December 2010, 08:25 AM   #1
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Default circuit board smelling like toxic waste

I have an Onkyo A919- circa 1992. so it's not exactly a vintage. It's a mosfet/bjt hybrid amp and the tubiest SS sound I've ever come across. It also smells like burning styrofoam. From sticking my nose to the components, I'm certain that it's coming from the circuit boards. I already had one bad experience with a vintage Sansui au-D907 that was stinking from the circuit boards due to it's age. (phenolic boards smelling like roses... and ***) But to have the same symptom from an amp that's only 8 years old is a surprise to me. Is my situation unusual? Could this 100V only amp being operated on 115V stepdown by the previous owner have accelerated the degradation of the pcbs? and what exactly do you think is contributing to this burnt styrofoam/industrial solvent-like smell?
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Old 24th December 2010, 08:41 AM   #2
poynton is offline poynton  United Kingdom
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I had an amp which smelled like a cat had cr@pped inside.
So perhaps it's not so uncommon.


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Old 24th December 2010, 03:54 PM   #3
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I have a sansui AU-D11 that is the best amplifier that I ever heard and I heard lots of them, including some very expensive ones like Krell etc. Nothing compares to that sound. And nothing compares to the smell coming from those PCBs. I tried everything: Sun exposure, cleaning products nothing works. I had to take it out of home. Im thinking of taking out the phono PCBs, wich i don't use, and making some PCB cloning of the amp and power source and transferring the parts to new PCBs. I refuse to let it go.
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Old 24th December 2010, 03:59 PM   #4
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Quote:
Originally Posted by PreSapian View Post
I have an Onkyo A919- circa 1992. so it's not exactly a vintage. It's a mosfet/bjt hybrid amp and the tubiest SS sound I've ever come across. It also smells like burning styrofoam. From sticking my nose to the components, I'm certain that it's coming from the circuit boards. I already had one bad experience with a vintage Sansui au-D907 that was stinking from the circuit boards due to it's age. (phenolic boards smelling like roses... and ***) But to have the same symptom from an amp that's only 8 years old is a surprise to me. Is my situation unusual? Could this 100V only amp being operated on 115V stepdown by the previous owner have accelerated the degradation of the pcbs? and what exactly do you think is contributing to this burnt styrofoam/industrial solvent-like smell?
I have a Sansui A80 and I never had a problem like yours. Have you tried to clean it? Perhaps there is hidden dirt that is heated by the use of the amplifier
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Old 24th December 2010, 04:44 PM   #5
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A little spray of Chanel No.5 should do the trick :P
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Old 24th December 2010, 11:19 PM   #6
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Originally Posted by jmmartins View Post
I have a sansui AU-D11 that is the best amplifier that I ever heard and I heard lots of them, including some very expensive ones like Krell etc. Nothing compares to that sound. And nothing compares to the smell coming from those PCBs. I tried everything: Sun exposure, cleaning products nothing works. I had to take it out of home. Im thinking of taking out the phono PCBs, wich i don't use, and making some PCB cloning of the amp and power source and transferring the parts to new PCBs. I refuse to let it go.
I know what you mean. my sansui AU-D907Limited was ungodly when I had it hooked up. I auditioned some high end exotics during that period and nothing impressed me, not even the flagship macintosh. but according to the vintage fanatics at audiokarma, sansui's later alpha models should sound even better than their vintage ancestors, although their build quality might suggest otherwise.
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Old 26th December 2010, 09:45 AM   #7
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Originally Posted by chlorofille View Post
A little spray of Chanel No.5 should do the trick :P
Yep although Chanel n 5 is way better in a more fleshy, soft amplifier
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