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What's wrong with this amp? PICS inside
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<blockquote data-quote="dB-r" data-source="post: 6184942" data-attributes="member: 574699"><p>I recently had an old SoundStream Reference 300 here, looked to be a simple fix, just replaced the power supply FETs, and the PWM IC.</p><p></p><p>I replaced it with a SG3525 IC. I could never figure out why it would not work right... was a retardedly simple little amp, hardly anything in it... So I got frustrated and sent it to another shop we use. The guy writes back:</p><p></p><p>SS Ref 300 - DONE Wrong PWM IC, SG3525, supposed to be SG3524....</p><p></p><p>LOL... I couldn't believe it, I never even noticed when I pulled the original IC that it was a "24" instead of a "25". He is old school, been doing this a long time, since mid 80's, I am fairly new to amp repair, so I had never recalled seeing a SG3524 before.....</p><p></p><p>The 494 likely shorted internally and burned the ground pin off itself.... could happen if the right parts inside that IC short. Could have also caused the amp to fail. So it could be the 494's fault entirely, but just not common, those IC's are tanks in the proper circuits, that's why they are so popular, cheap, simple, and they work goooood for an unregulated simple SMPS in car stereo amps with a basic protect circuit.</p></blockquote><p></p>
[QUOTE="dB-r, post: 6184942, member: 574699"] I recently had an old SoundStream Reference 300 here, looked to be a simple fix, just replaced the power supply FETs, and the PWM IC. I replaced it with a SG3525 IC. I could never figure out why it would not work right... was a retardedly simple little amp, hardly anything in it... So I got frustrated and sent it to another shop we use. The guy writes back: SS Ref 300 - DONE Wrong PWM IC, SG3525, supposed to be SG3524.... LOL... I couldn't believe it, I never even noticed when I pulled the original IC that it was a "24" instead of a "25". He is old school, been doing this a long time, since mid 80's, I am fairly new to amp repair, so I had never recalled seeing a SG3524 before..... The 494 likely shorted internally and burned the ground pin off itself.... could happen if the right parts inside that IC short. Could have also caused the amp to fail. So it could be the 494's fault entirely, but just not common, those IC's are tanks in the proper circuits, that's why they are so popular, cheap, simple, and they work goooood for an unregulated simple SMPS in car stereo amps with a basic protect circuit. [/QUOTE]
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