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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

Showing 2 responses by jhajeski

jhajeski OP
119 posts
 
10-4 thanks 
jhajeski OP
119 posts
 
@jasonbourne52 - thanks for the recommendation, I have a voltmeter (somewhere) in the garage (and a cheater) I’ll dig them out.   

@tvad — the html link didn’t work for me, can you re-post what’s on the other end of that link

@fuzztone — I haven’t scoped out his A/C outlet orientation/situation (yet), I’ll know more once I get over there this weekend 

Thanks guys (and gals??)…appreciate any & all input.  
Best regards,
Jim
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