[Mike-48]

James,

We have moved and I set up my system in a room on the second floor. It turns out that the 3-pin AC receptacles are NOT grounded but are protected by a GFCI (ground-fault current interrupter). Do I risk harm to myself or the amp by using my 14B SST on this circuit? 

I am looking into having a new grounded circuit installed, but I'd like music in the meantime.

THANKS.

Mike

[Occam]

You're good to go.
http://www.mikeholt.com/technical.php?id=grounding/unformatted/recept2wire&type=u&title=GFCI%20-%20Receptacles%20Without%20A%20Ground%20(12-30-99)
Please exercise the test button on your GFCI

[Mike-48]

Occam, thanks for the reference!

[Speedskater]

Mike Holt publications and forum are the go-to reference source on AC power, NEC rules and safety.