The case for "leaving it on":
Claim 1: the temperature of the components stabilize, providing a consistent sound.
Claim 2: the sound is better, because the temperature is stabilized at the design temperature, which the unit presuma bly ran at while being voiced by the designer.
Claim 3: reliability is better, due to absence of thermal cycling and resultant mechanical stresses on the components and circuit interconnections.
Claim 4: reliability is better, due to absence of large inrush currents at power-on.
There's also a good case to be made for leaving power amps turned off (but that's not your question). Suffice it to say I've considered both sides of the issue and leave my space heater (Aragon 8008 BB) turned off when not in use.
Claim 1: the temperature of the components stabilize, providing a consistent sound.
Claim 2: the sound is better, because the temperature is stabilized at the design temperature, which the unit presuma bly ran at while being voiced by the designer.
Claim 3: reliability is better, due to absence of thermal cycling and resultant mechanical stresses on the components and circuit interconnections.
Claim 4: reliability is better, due to absence of large inrush currents at power-on.
There's also a good case to be made for leaving power amps turned off (but that's not your question). Suffice it to say I've considered both sides of the issue and leave my space heater (Aragon 8008 BB) turned off when not in use.