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Ugly, it's a good thing you asked ahead of time




The little on the back of the 651P power input jack is a sine wave. That means you have to input 12 volts AC, not 12 volts DC. The rectification to DC is done internally. Using the wrong supply may have caused serious damage to your Cambridge phono stage.

If you're looking for an improvement, get yourself a high current transformer that outputs 12 volts AC. The lower impedance of the big transformer will give you improved sonics, according to Paul McGowan of PS Audio.

If it were me, the next thing I'd be looking at would be to upgrade the voltage regulator(s). I've had excellent results with a Belleson SuperPower regulator in my Graham Slee Reflex phono stage.



Edits: 10/07/14

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