Depends on the amp, if it is a solid state amp, it will most likely be fine. Tube amps have to have a load. What kind of amp is it? Check the manual, it should say "do not use without a speaker load connected" or something like that if it will hurt it.
A dead short, i.e. a straight wire across the outputs, is 0 ohms, whereas an open, i.e. nothing connected, is infinite ohms, which is why it usually doesn't hurt ss power amps. Really, I studied this stuff for 4 years in college.
It doesn't work for tube amps though, they need a load across them.
No problem, I really wasn't trying to sound like an a$$, just didn't want anyone misled. An amp maker would never use a shorting jack on an output, maybe a switching jack that put a "dummy" load in place in case nothing was hooked up (Koch to name one). The reason for the input jack to short to ground it to kill noise when nothing is hooked to it.
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