Tube amps don’t need to be on all the time. 20 minutes is more than enough time to stabilize.
Solar input for Arizona is around 8 KWh/m²/day. A 2400ft² roof is about 1.8 GIGAwatts per day.
A refrigerator, computer, TV and all the other electric stuff generates far more heat than a tube amp.
The San Fernando Valley has many days over 100°F and mid 20th century houses were not very well insulated.
A 40w tube amp is about 0.2 kW/h. The additional heat when dissipated by the fans will not be noticed.
Solar input for Arizona is around 8 KWh/m²/day. A 2400ft² roof is about 1.8 GIGAwatts per day.
A refrigerator, computer, TV and all the other electric stuff generates far more heat than a tube amp.
The San Fernando Valley has many days over 100°F and mid 20th century houses were not very well insulated.
A 40w tube amp is about 0.2 kW/h. The additional heat when dissipated by the fans will not be noticed.