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A/C power line polarity on new phono preamp

Getting ready to help a buddy finish setting up a new phono preamp over the weekend…he’s not sure about the A/C power line polarity (rear panel switch allows “A” to “B” switching for best performance).   Any suggestions on what’s best to listen to as you switch from A to B ?   Certain kinds of music and/or test tones best for this?   Any specific suggestions welcome.   
Thanks
jhajeski
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gs5556
1,218 posts
 
I'm pretty sure that switch is for signal polarity, not AC power.
dwmaggie
222 posts
 
+1tvad
A simple 3 prong plug in device with 3 leds.  The leds indicate the polarity status.  A fast method of determining the polarity of a wall plug.  Had a Sears, now use a Harbor Freight brand.  It is called a outlet circuit tester model GFCI.
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jasonbourne52's avatar
jasonbourne52
2,863 posts
 
I have never bothered with checking the AC plug orientation. The difference is so small that it is inaudible to me.
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