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Generally no. In some cases yes. Most DC wall warts are isolated supplies so you can put them in series to get a higher voltage but the current will be the lower of the two supplies and voltage stability may be lower. In parallel you have to make sure the voltages that the supplies actually produce (not the ones they're marked as being) is exactly the same, or current will flow between the two supplies. You can use a diode to prevent the current from feeding back into the supplies but you lose a bit of power from the diode's and it's not going to be as stable as if you'd used a single power supply of the proper rating.
Well like maybe I could buy another Power Designs 3650, which is 36V/5A, so with 2 I could have access to 36V/10A or 72V/5A, or close to it.
I guess its safe to say they would all be linear bench supplies. Like right now I have the 3650, but if that ever proves to have insufficient specs, instead of trying to replace it Id like to know if I could just run 2 supplies.
Little quirks like current being the lower of the 2, or requiring a diode are no big deal. So it seems that the answer is yes?