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Vacuum tube 300B is a mysterious vacuum tube with a long history, and don’t know how many music fans are fascinated. I still don’t know how many people are struggling to find its real voice. The audiophiles think that 300B is a female voice representative. But our 300B kit circuit is the embodiment of the sound of rigidity and softness. It is not only an attentive and charming woman, but also an iron and tender prince charming. The vacuum tube 6F3 is a relatively unpopular composite tube, which is quite a 12ax7 6p14 inside. Because of the large inventory, the price is related low, but its performance is extremely excellent, especially when it is connected as triode tube, which output internal resistance is particularly low, and linearity is good, driving 300B is absolutely no problem. In addition, many senior enthusiasts will inevitably ask, why use large loop feedback? This is our consideration of sound and stability. The large loop will sacrifice the transparency of mid and high frequencies. However,
