its the 6112 tube, called the mu-vista by MF, and it lasts a VERY_ long time, so go ahead and leave the unit on if you like. by the way, this info IS on their web site.
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Yes it is 6112 tube named mu-vista. A tube used in military. According to dealer of my A5CD, this tube has a life-time 100,000 hours and it is very fast to get warm up. This is why you turn on the Amp cold and get output sound immediately. Each A5cd comes with one spare 6112 stored with the dealer. So, in case one of your tubes is malfunctioning, the dealer can replace it for you.
Because MF has a limited number of 6112s, this is why A5cd is produced under a limited edition basis.
Hope I am getting this right as I am a newbie.