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How about using a portable backup power source like this one (for example): http://www.xantrex.com/power-products/backup-power/xpower-powerpack-400.aspx Depends on your amp, I guess. Sylvain On Mon, Jan 16, 2012 at 11:37 AM, Tom Swirly <tom@swirly.com> wrote: > Ooh, thanks for the ideas. > > The AC-33 looks very nice, but it doesn't seem to do the 9V - perhaps I > could have a separate battery for that?