Whether a bad practice or not, i never leave something on forever. Heating and cooling cycles may cause strain but depends also on on construction and casing and how fast it cools down after shut off.
I had the same question for whether to keep my first watt j2 on all the time or no. i posed the same question to Nelson Pass and he said one should keep it off until an hour or so before listening. Keeping it on all the time can reduce its life he said.
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