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Old 22nd February 2010, 10:18 PM   #11
tomchr is offline tomchr  United States
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I got the hum issues sorted out. The 60 Hz I was seeing was due to EMI pick-up. When I shielded the amp in grounded aluminum foil, the last bit of 60 Hz went away.

Another potential source of 60 Hz hum is a defective rectifier.

120 Hz on the other hand is always ripple. Of course, those in countries where 50 Hz mains are used, substitute 50/100 Hz for 60/120 Hz above.

~Tom
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