Power Supply of HT-dual

[dule]

When I plug in power supply into HT-dual, the light of tube below the gril turns on red, which means that tube has got a power. Is it necessery to unplug power supply from the pedal when I'm not using it (not playing guitar), or just let it powered (power supply plugged in)? I'm just wondering is it dangerous to left this hight voltage pedal powered when it is not in use and will tube wear faster if it is constantly under power supply? For example, I'm keeping my Boss and Marshall pedals powered when they are not in use, but they are low voltage and HT-dual is powered by 300V inside the box, which is quite different issue. I haven't found any single word about this topic in User's manual. Thanks.

[Daneelv]

I'm interested to find out also. I see the light is just an LED below the tube though - I'm not sure if the tube is powered when neither channel is selected?