When using a 24v 1amp battery pack, are you feeding the porda corda a constant 24 volts? Or are the batteries running in parallel to feed it a constant 9 volts for a longer life? Sorry if I'm coming off as a little bit slow here, I'm just not very familiar with electrical applications and I want to be safe about this. A constant 24 volts wont melt my amp will it?
A constant 28 volts will not damage the amp. Keep in mind though if you want to use an unregulated walwart supply instead of batteries, that the rated voltage is for a fully loaded condition and it will deliver higher voltages at lower currents like the porta corda requires. If you get a regulated 24 volt walwart supply you should be fine, and it can be a lot cheaper than batteries in the long run.