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DIY & Tutorials
DIY For Audio
A little help with a Pioneer sa-408
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<blockquote data-quote="JohnnyIC" data-source="post: 525587" data-attributes="member: 15708"><p>Hey guys.</p><p></p><p>I received this little amp for free from someone who told me they switched it on and saw smoke coming out of it. I have always wanted to try my hand at fixing old amplifiers and thought this would be a good place to start..</p><p></p><p>Fast forward to today. I have so far replaced one shorted output transistor and the other three which were also bad, I also replaced two of the smaller transistors (one was completely split in two) and one 4.7ohms resistor which was burnt. </p><p>Now the only other fault I could find were these two RGC22 emitter resistors which seems to be shorted? I get a reading of 0.000 when testing them on a dmm in diode mode. </p><p>Apparantly they don't make these RGC22 dual transistors anymore, can I just replace them with two normal transistors instead?</p><p>Here's a pic of the culprit (the big white one with 3 pins):</p><p> </p><p><img src="http://s15.postimg.org/vnphbq1zv/IMG_0480.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Anything else I should check for?</p><p></p><p>Thanks</p></blockquote><p></p>
[QUOTE="JohnnyIC, post: 525587, member: 15708"] Hey guys. I received this little amp for free from someone who told me they switched it on and saw smoke coming out of it. I have always wanted to try my hand at fixing old amplifiers and thought this would be a good place to start.. Fast forward to today. I have so far replaced one shorted output transistor and the other three which were also bad, I also replaced two of the smaller transistors (one was completely split in two) and one 4.7ohms resistor which was burnt. Now the only other fault I could find were these two RGC22 emitter resistors which seems to be shorted? I get a reading of 0.000 when testing them on a dmm in diode mode. Apparantly they don't make these RGC22 dual transistors anymore, can I just replace them with two normal transistors instead? Here's a pic of the culprit (the big white one with 3 pins): [IMG]http://s15.postimg.org/vnphbq1zv/IMG_0480.jpg[/IMG] Anything else I should check for? Thanks [/QUOTE]
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DIY & Tutorials
DIY For Audio
A little help with a Pioneer sa-408
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