Pass Xa25. Nelson says leave it on for an hour. I have left it on for a week to experiment. There is better space and transients. Not worth the electricity. Fyi. Warm but not hot after that. I turn off the tube preamp because i am under the assumption hours of life counts when turned on.
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.
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