Did I just cook my preamp?

After getting things back into place, I listened to some music using coaxial input before reconnecting the interconnects of the phono stage.

 @obarrett 

??? please explain ??? coaxial input? Source?

To get a spark as well as an electrical shock there had to be a difference of potential, voltage, of a least around 40V to 50V measured between the two points you received the electrical shock. I assume all the equipment is plugged into a single duplex outlet fed from a single circuit breaker in the electrical panel.

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Simaudio Moon 110LP phono preamp. Factory plug in power supply is two blade, no safety ground pin. I assume the power supply is the original.

Outlaw Audio RR2160 amp has only a two prong power inlet connector. No safety ground prong. Unit has the Double D symbol logo on the unit indicating the 120Vac power wiring is double insulated. Chances of a hot bared conductor to chassis fault? Slim to to none.

VPI Classic. Has a 3 prong inlet connector. Safety equipment ground is used.

I wouldn’t think the tone arm would be connected to the AC mains safety equipment ground.

Do you have a multimeter you can use to check for continuity/resistance, as well for voltages? If not buy a descent one. You can pick a descent one for around $50.00.

If you have one or buy one, post back.

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@obarrett Said:

Incredibly, when I was unplugging the phono preamp, I actually got some current from simply touching the exterior of the box.

To receive the electrical shock your body had to have a point of entry and a point of exist. Can you recall what two metal objects you were contacting at the same time? One was the metal case of the 24Vdc fed phono preamp. I assume the plug in power supply (output 24Vdc) for the the phono preamp is plastic. Is the wall duplex outlet cover plate plastic?

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and this box was grounded to the turntable with a ground cable, which was connected to the outlet with a three prong cable with ground.

That doesn't sound right. The phono preamp should be grounded to the tone arm, not to the wall AC mains safety equipment ground...

Using a multimeter, this could easily be verified. 

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Safety advice: do not turn on the questionable electronics until repaired, and get a socket tester for your house. They’re not expensive and are worth getting.

The OP should first locate the problem. Was it the phono preamp power supply that caused the problem?

Or was it x or y or z that caused the problem that damaged the phono preamp?

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FYI, in older homes with old two wire branch circuit wiring, a plug-in circuit tester works good for finding reversed AC polarity. They will tell you if there is an OPEN GROUND. What they don’t tell you if the tester says OK is the EGC (Equipment Grounding Conductor) really an EGC that runs back to the electrical panel or is it a Boot Leg EGC created by installing a jumper from the neutral terminal on a duplex receptacle to the EGC terminal screw on the outlet. It will also not tell you if the neutral conductor and EGC conductor are reversed on the outlet.

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EDIT:

works good for finding reversed AC polarity.

works good for finding reversed Hot/neutral AC polarity.

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