Cold

[old_tv_nut]

I haven't heard of problems with cold storage (but I agree on letting it come to room temperature for a day to dryout any condensation). Some early sets with solid-state horizontal outputs had problems if stored in very humid places (like a warehouse in New Orleans) for a long time, because the flybacks would heat up rapidly when turned on and boil the absorbed moisture, exploding the donut. Better flyback design solved this. Tube sets would limit the current more and just not perform correctly until the moisture was eliminated.