Compared to most audio valves, the 300B or 2A3 is quite large. It is a directly heated triode capable of 40watts dissapation. This PS Vane example has a ceramic base for prolonged life. (The early bakelite bases were prone to crumble due to extended exposure to heat.
"In electronics the 300B is a directly-heated power triode vacuum tube with a four-pin base, introduced in 1938 to amplify telephone signals. It measures 6.4 inches high and 2.4 inches wide, and the anode can dissipate 40 watts. In the 1980s it started to be used increasingly by audiophiles in home audio equipment. The 300B has good linearity, low noise and good reliability; it is often used in single-ended triode (SET) audio amplifiers of about eight watts output; a push-pull pair can output 20 watts." wikipedia
I can be used as an output device in it's own right, or is commonly used as a driver for the larger 845 triode (coming soon!).
"In electronics the 300B is a directly-heated power triode vacuum tube with a four-pin base, introduced in 1938 to amplify telephone signals. It measures 6.4 inches high and 2.4 inches wide, and the anode can dissipate 40 watts. In the 1980s it started to be used increasingly by audiophiles in home audio equipment. The 300B has good linearity, low noise and good reliability; it is often used in single-ended triode (SET) audio amplifiers of about eight watts output; a push-pull pair can output 20 watts." wikipedia
I can be used as an output device in it's own right, or is commonly used as a driver for the larger 845 triode (coming soon!).
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