The LM3875 alone have THD+Noise of only 0.006% and linearity 0.04% And become one-year famousin professionals and Hi-Fi-diyers. WE run it at +-35V and the tube buffer at +-24V with cathode-follwer circuit to ensure lower impedance for the IC WE remove 1 capacitor from the IC input to make it more clear sound. And add speaker protectin circuit. The IC does not get much heat on it. and so the tube,we add rectifier to filament to eliminAte the noise of hum make it widely use of any 6DJ8,6922,6N1P of any manufacturer, Russian tubes have very good sound but it will hum, we eliminate all the chance of hum, The next generation i will use LM3886 it will be easy to get it becaus NS make out 100millions of them per year and cease making LM3875, As i heard it. Listening Impressions: Me, as the tube amp maker, i like tube sound for reality of music, I accept that LM3875 has a very good sound, by adding a tube buffer it goes more clear, sound like REAL piano, You will sometimes frighten of any sound of sunnden such as claps, or from the singer, you will think someone going to your room, the attack transient of guitars are REAL, I must say the you can get the sound of thousand dollars amp in only 400U SD. So let's ask for it. The Dynamic of power and very clear-natural sound like those tube amp in our best price.

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