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<blockquote data-quote="TMali" data-source="post: 6770855" data-attributes="member: 615807">can anyone make sense of this??Otherwise, it&#039;s likely that the output transistors failed. That&#039;s the most common cause for an amplifier to go into protection. With no power applied to the amp, grab a multimeter, set it to ohms, and measure the resistance between the output transistors terminals. You should find none that have anything close to zero ohms between any of the terminals. If you find one or more that read ~0 ohms between therminals, they need to be removed from the circuit and checked. If you have several in parallel, it may seem as though the entire group shorted, but generally one fails and the others are OK. Of course, when you have one defective transistor in a group of parallel transistors, you must replace all of the transistors in that group. Open or broken emitter resistors can cause an amp to go into protect. If you don&#039;t find any shorted outputs, make sure there are no broken terminals on the emitter resistors</blockquote>

[QUOTE="TMali, post: 6770855, member: 615807"] can anyone make sense of this?? Otherwise, it's likely that the output transistors failed. That's the most common cause for an amplifier to go into protection. With no power applied to the amp, grab a multimeter, set it to ohms, and measure the resistance between the output transistors terminals. You should find none that have anything close to zero ohms between any of the terminals. If you find one or more that read ~0 ohms between therminals, they need to be removed from the circuit and checked. If you have several in parallel, it may seem as though the entire group shorted, but generally one fails and the others are OK. Of course, when you have one defective transistor in a group of parallel transistors, you must replace all of the transistors in that group. Open or broken emitter resistors can cause an amp to go into protect. If you don't find any shorted outputs, make sure there are no broken terminals on the emitter resistors [/QUOTE]

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