What receptacle for 240V 20A in the States?

Not to through a fly in the ointment. But it is possible you may effect the sonics of the Amp. For better, or worse??

From the mains of the U.S. 240V you will essentially be feeding the Amp from a balanced power system. Also the voltage may be closer to 250V + . You may want to have that checked first. Also check what the maximum input AC voltage rating is for the Amp.

As for the NEMA 6-20R receptacle that would be a good choice. If you already have an extra 120V dedicated circuit by your audio system all you will need is a 2 pole 20 amp breaker installed at the electrical panel and the two insulated conductors of the dedicated branch circuit terminated on the 2pole breaker.

Guys, thanks for all the excellent responses!

I now have some receptacles and plugs. I bought 2 different types because I was not sure if I needed a 3 or 4 wire (Hubbell HBL2320 and HBL2410) while at the store.

I should have mentioned that the amp (originally from Europe) 220V but uses 1 hot, 1 neutral, 1 ground, like 120V in USA/Canada. I noticed that the new HBL 2320 receptacle uses 2 hots and 1 ground...Can I use this?

The HBL 2410 has 4 wires...I believe this is wrong for the application.

Jea48 - I actaully have 2 unused dedicated 120V lines, I wanted to connect both hots to make 240V. I am sure you are right about my voltage, it will be 250V, since I get about 125 on a single line. I was hoping to connect the 2 hots, a neutral and ground, then emulate what is happening in Europe.

Ngjockey - I don't know why this would be out of phase when the breakers are on the same buss bar? I am not trying to tell you that you are wrong...just trying to learn. Also you mention to cheat and put 2 hots on a 3 prong outlet...but I think that is how it looks on my oven for example.

Thanks again guys!
Mike

Angus80808, You will need to reconfigure one of the existing 120V dedicated branch circuits to a 250V dedicated branch circuit. At the electrical panel the 250V branch circuit must be connected to a 2 pole breaker. If the wire is #12 awg and the receptacle is a 20 amp then the breaker must be a 2 pole 20 amp breaker.

As in regards to phasing the power that feeds your home is fed from a split phase secondary winding of the power company's utility transformer. Single phase, only one phase. Two hot ungrounded conductors with a center tapped grounded conductor, the neutral.

Jea48 - Yes, as you mentioned, I will connect to a 2 pole breaker (2x 120V). The wire is #10 awg and will use with a 20 amp circuit...(or maybe 30A??) This makes sense to me.

I guess I'm worried that there is no neutral wire going to the amp, should I be?

Thanks!
Mike

Please, call an electrician before starting.