MX50SE Power Amplifier Boards

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Meerkat 67

Joined Jan 29, 2015
36
Recently built an amp using a old chassis using these boards for the output. I did sell the amp and it was working well until the buyer told me it was smoking and returned it. I know the user likes to crank up the volume so I had included a speaker protection circuit and used a Toroid Transformer and a 25 amp power supply with 85 volt caps for filtering..A close examination of the output modules shows a number of burnt resistors and I mean charred! and the output transistors are gone as well. I did read somewhere that these boards are hit or miss and suspect to bogus parts. I do have replacements but are hesitant to put these in if they are just going to fail again.. . Anyone have any experience with these amps burning out.?
Any thoughts, feedback, suggestions would be welcome Thanks Wayne
 
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