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eq amp hum

  1. M

    STA-2300 power supply issue

    The issue started when the eq amp developed a loud hum. Then, I noticed that with no input and volume maxed, there was a similar, but faint hum in the aux input. In testing the power supply board I found AC ripple on the B+ and speaker protect/relay supply outputs( pins 8,[9: not shown],10). The...
    • Matt_ME
    • Thread
    • eq amp hum power supply board relay board speaker protect board sta-2300
    • Replies: 2
    • Forum: Solid State
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