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Old 25th August 2007, 08:50 PM   #1
Jeb-D. is offline Jeb-D.  United States
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Default Help! Phono stage LF instability

This topic has come up before, but I can't find the thread. My newly built phono stage has some kind of low frequency(subsonic) instability/oscillation. It occurs with or without a load.

What are common causes for this?

I can post a schematic later if that will help
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Old 25th August 2007, 09:42 PM   #2
Jeb-D. is offline Jeb-D.  United States
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Nevermind, found the issue. My soldering iron was plugged into the same power strip and it was causing sagging in the mains. It's a temp cycle controlled type.
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Old 25th August 2007, 10:39 PM   #3
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Great catch. That could have turned frustrating.
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