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In Reply to: RE: Vintage Power Cords posted by mark.korda@myfairpoint.net on January 31, 2017 at 05:38:07
You asked a question and I'll do my best to answer it. It's called "absolute phase". It's really not that difficult. Imagine your loudspeaker connection. The speaker will produce sound when connected either way, but the correct way is clearly better. The easiest way to measure is with a volt meter. With the amp powered up, measure from the metal chassis to earth ground. Reverse the outlet plug and remeasure. The orientation that give the least amount of voltage readings should give the best sound.
I have an ST-35 as well BTW. You also may get why I checked out on answering questions years ago on the asylum. It isn't called the asylum for nothing. It'll drive you crazy if you aren't already. Lol
Follow Ups:
I agree with Sam that measuring an older plug with two blades only requires reversing the plug while measuring both positions.
However, with newer grounded plugs I make three readings. First in the normal position with the ground pin (3rd) inserted. Then I measure with a "cheater" plug (3 into 2), now ungrounded, with the same orientation. Lastly I reverse the cheater plug.
I've found I cannot predict which orientation will give the lowest voltage reading, experimenting is the only way.
"The piano ain't got no wrong notes." Thelonious Monk
It seems like I remember seeing some HQ cords have a removable ground terminal.
Lots of playing around to get the best sound, but so worth it!
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