The 300B is a directly-heated power triode tube with a four-pin base, introduced in 1938 by Western Electric to amplify telephone signals. It measures aproximately 165mm high x 62mm 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 aproximately 20 watts.

Please note: - Due to low demand and high cost of these tubes we do not carry stock, but can source and import the following brands on order. 

Valve Art 300B

JJ Electronic 300B

Electro-Harmonix 300B  (Gold Pin)

Genalex Gold Lion PX300B (Gold Pin)

Please email sales@tonetubes.co.za for further details and pricing