In electronics, the 300B is a directly-heated power triode vacuum tube with a four-pin base, introduced in 1938 by Western Electric to amplify telephone signals.

Find out what tube aficionados all over the globe know, the WE 300B is the most natural, elegant and emotive triode anywhere in the known universe. The legendary 300B triode is …

Tube 300B or Röhre 300B ID21371, Triode, vacuum, UX-Base (4 Pins (2 thick, USA 1924, UX) and Power/Output shown. Radio tubes are valves.

The 300B vacuum tube was first mass produced by Western Electric in 1938. Since that time the 300B power tube has become possibly the most revered tube in high end hi-fi amplifiers.

Download our comprehensive Western Electric 300B tube data sheet for detailed specifications, operating parameters, and characteristic curves. Each tube comes with individual test results …

Oct 10, 2025 · We see 300B often used with medium efficiency loudspeakers. Meaning, the tube often needs to work relatively hard, which is indeed what the 300B is designed for. However, a …

It is not the old ST came back rather it is a carefully crafted, researched new 300B model. The result is a 300B mesh plate tube with super clarity, low distortion and out of this world mid …

Base and Mounting similar sockets. The 300B tube has the bay-onet pin so located that it may also be mounted in a Western Electric 100M, 115B o zontal position. If mount-ed in a …

The 300B tube, originally designed by Western Electric (WE 300B/Western Electric 300B) in the 1930s, has become a legendary electron tube in the world of hi-fi audio.

Widely renowned for its natural and emotive sound, the 300B vacuum tube has gained a legendary status in the world of high-fidelity audio. Its warm and rich tones, coupled with its …