If I were you I wouldn't try it. Too many times a tiny error has ended up in a blown amp. It's better to just power it down. One tiny mistake and you'll wish you never thought of leaving it on.
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A agree this is not a wise thing to do for so many reasons. And putting a resistor across the amp? You plan on removing/reconnecting this resistor each and every time to swap cables on/off the amp? This only doubles the possibility of shorting the terminals on the back of the amp. The strip terminals on these older amps are a pain enough when the amp is off. And who said the amp necessarily needs a load when it is powered on anyway. Just because it is a tube amp does not mean it is unstable without a load. A call to ARC would answer this for your amp......but this whole process is only asking for trouble. And if a disaster occured, you would most likely become a recipient of a Darwin award. Don't do it.