Maintenance and surgery
10.1 Classifying failures
When an amplifier needs repair, the cause is usually one of the following:
Electrical abuse damage
This is the most common cause when the less rugged kind of solid-state, mainly audiophile-grade domestic power amplifier, which stands little abuse, needs repair. The most common victims are output and driver power transistors and associated, fry-able parts, usually resistors. Such equipment commonly omits high temperature warning, thermal protection, effective DC protection, discriminative fusing, power up/down muting and other stress-relieving or protective mechanisms. When high sound quality is being provided at low cost, this understandable. Alas, the maker often neglects to remind the ...
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