I agree, it takes my system at least 3 hours and preferably 4 hours before it sounds optimum.
Two downsides I see.
1. power bill might raise a couple of dollars.
2. Electrolytic capacitors degrade faster as the temperature rises. The rule of thumb used to be
half life for every 20 degree rise. A better way of putting it is for every 20 degrees below the caps
maximum rating, life was doubled.
So if the cap is rated 85C (185F), at 165 doubled, at 145 four times, 125 eight times, and 105F, 16 times.
Below maximum repetitive current also plays a part in cap life, but one usually doesn't know what that figure is
for a cap in a particular circuit. However, we do know that in preamplifiers, the repetitive current is generally
quite small compared to the max repetitive current rating for a particular electrolytic cap.
Another idea is the change the power switch for double throw, so when the switch is turned off, a power
resistor(s) would heat the component to a certain temperature. Multiple resistors around the chassis
would be even better for even heating. But then, the electrolytics would begin to suffer, depending upon
the temperature set.
cheers
steve