Help! Phono stage LF instability

Jeb-D. · 25th August 2007, 07:50 PM

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

Jeb-D. · 25th August 2007, 08:42 PM

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.

pedroskova · 25th August 2007, 09:39 PM

Great catch. That could have turned frustrating.

25th August 2007, 07:50 PM	#1
Jeb-D. diyAudio Member Join Date: Nov 2005 Location: SoCal	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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25th August 2007, 08:42 PM	#2
Jeb-D. diyAudio Member Join Date: Nov 2005 Location: SoCal	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.

25th August 2007, 09:39 PM	#3
pedroskova RIP Join Date: Dec 2002 Location: C'ville VA, USA	Great catch. That could have turned frustrating.

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