Not just an replacement, but an improvement!

This tube is a stronger version of the 300B.  The difference is, the 302B has 20% larger filaments and extra cooling plates.  It has the same tube curves as the normal 300B, and will behave the same in any 300B amplifier. When biased higher than a standard 300B, this tube will show it's superior quality, by giving better dynamic behaviour, and lower distortion at all power levels.  All critical parts, like filaments, grids and plates are constructed of hard metal for higher reliability and reproducable quality. 

• Hard metal filaments and Plates, Wolfram Grids (Note1)
• 4 circular cooling plates 
• Wolfram Grids (Note1)
• Two extra large getters, flashing the complete tube bottem. 
• Hand blown ST Glass bulb
• Anti-microphonic plate- and grid  suspension
• These tubes are shipped in a high quality dual box
• Tube pinting with real gold (metal),  red color is burned into the glass 
• Machined, solid tube base pins for highest contact precision. Ideal for the YAMAMOTO tube sockets. 
• Gold plated pins,  black ceramic socket.  (White bottem)

• Note 1)  Hard-metal filaments prevent filament breakage with DHT Tubes.  This material has a higher melting point than the classical nickel wires. Hard metal plates have a more precise plate distance, and do not change shape when heated.  This ensures  reproducable tube parameters, and long term stability. Wolfram grids  allow the most precise grid wire distance, because wolfram is an extreme hard metal.   This ensures better uniformity and linearity at the low end of the tube curves.
• Note 2)  Individual Test data, such as:  Matching Data, Grid Current, Vacuum, Filament Current, etc,  are on the Certificate that comes with each individual Tube.  Each tube is numbered, inside the bulb  with a metal Tag
• Note 3)  Plate Curves:  Made with the Sofia Digital Curve tracer.  Plate curves with courtesy of AMR