Golden Voice Tubes 300B-H.
This is a copy of WE300B. The Filament structure，top mica sheet and anode plate structure are very similar to the WE300B, there is a slight difference between the size of the glass and the WE300B.
300B is directly-heated type cathode triode, used as class A1. In audio amplifier it suits for the condition that the output power is 10W.