Not just an replacement, but an improvement!

This tube is a direct replacement for original the RCA 2A3 monoplate tube.   It will bias exactly at the original operating point.  For those who whish to operate this tube at a higher power, this is also possible. You can go up to 28Watt Single-Ended, which will give 9.3 Watt RMS output signal. For best sound, it is recommended to use a normal 2A3 SE transformer,  and get the higher dissipation by increasing the plate voltage. 

You can  make a push-pull circuit that has a peak power dissipation of 40Watt per tube, at  full output signal. This will give 40Watt (or more) output signal. Without signal, the power dissipation needs to drop at 28Watt per tube. 

Features

• Thick hard metal plates, with coolers 
• Fully compatible to RCA 2A3
• 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. Wolfram grids  allow the most precise grid wire distance, because wolfram is an extreme hard metal.   This ensures better grid  precision, which gives uniformity and better linearity at the low end of the tube currves.
• 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)  Tube Curves:  Made on the The Sofia Curve tracer, with courtesy of AMR, Wisconsin, USA.