To make a good electronic tube amplifier, firstly, the circuit process of the machine should be selected. The electronic tube amplifiers can be divided into two kinds. Following, we would like to have a brief introduction of the vacuum tube we make.  
  ※ Single end class a amplifier  
This kind of amplifier adopts 300B,845triode asdivisor tube。 The machine with such vacuum tubes is of beautiful voice, exact sound field localization.  
   
Backing stage69+dirver stage300BB+output stage845:
Power supply 5U4G+ backing stage, impulse6N9+output stage300B.
Of course6L6,EL34,EL844 vacuum tube should be selected.
   
  ※ quiescent push-pull amplifier：
Most oftube of different power can adopt such amplifiers. Such machine is of advantages such as big power and high efficiency. The single circuit is relative complicated. The debugging is a little trouble. The parlor’s requirements on vacuum tube will be relative high. During selection, the vacuum tubes of same performance should be selected.

The combination of suchcircuits is of diversity. There are parts such as power supply,, phase inversion, impulse and energy amplification, The power supply can be rectifier of5AR45Z3P according to the power requirements. The backing stage can be12AX7,6N9P,6N8P and other vacuum tube. The phase inversion dirver stage can be vacuum tubessuch as12AT7,12AU7,6N7PMost of the vacuum tube made by our company can be applied for power amplifier tube. The only difference is the output power, and timbre
We have developed a series of advanced fans tube Such as vacuum tube 300S for music fans. It is of well performance in both appearance and timbre. Welcome to use it.