What receptacle for 240V 20A in the States?

As for the wire size being #10 awg, because of the 20 amp receptacle you are using the branch circuit over current device, (the 2 pole breaker in this case), must be 20 amp. Not 15, not 30, it must be a 2 pole 20.....

I would exchange the receptacle and plug for 30A if I go that route.

Thanks again for your comments, I just wanted to understand what was going on.

Mike

I would exchange the receptacle and plug for 30A if I go that route.

Mike I would not recommend doing that. You will be fine with a 20 amp branch circuit. 240V X 20 amps = 4800 VA...
Jim

Jim, I'll take your advice and stay with the 20A.

The amp has the same transformer size as a Levinson #33 (10 kVa total), and I read that people were using 240V x 30 A or larger with those. I thought it made sense to do the same.

Thanks,
Mike