Fooling around with the stereo amps, 2 mono block @ 4 KT88s I have been looking into getting some new KT 88s for the project. Shuguang, a tube manufacturer over in China for over 50 years now has been using a HPCC coating on the inside of their tubes for a while now. It is supposed to keep stray electrons from reflecting off the glass envelope of the tube and promote directional solidification and single crystallization. So is the directional solidification the actual electron flow from grid to plate? What exactly is single crystallization in a tube as I haven't heard of these terms before. I have been told that these new designed tubes from China are very good indeed and the tube manufacturers over in Europe, South America and Russia are now adapting to the new HPCC coatings also. So is there actually something new happening in vacuum tube technology these days? Shuguang has produced 80% of the World's 300Bs that have been sold up to this PIT.