Emission Labs 300B 2.5V Mesh - 2A3 (Pair)

 It can be quickly seen from the 300B working points at 250V / 60mA / 2700 Ohms, that the output power is approximately 0.6 Watt higher, and the distortion is 4dB less. We have to say, this is so at 2700 Ohms load, whereas the RCA 2A3 working point is at 2500 Ohms load. So loading the 300B-2.5V with 2500 Ohms vs 2700 Ohms, will further increase the output power to an estimated 4.2 Watt, at the price of perhaps 1.5dB more distortion. Yet, this leaves us with distortion figures, better than 2A3 still, and output power higher than 2A3. This is the idea behind the 300B-2.5Volt. Bias Voltage at 60mA: It can be seen from the above tables, bias of the 300B25V differs 3 Volts from the 2A3. This is much within the natural tolerance of the 2A3. Though this was never officially specified, the bias voltage can well vary from -38V to -55V for some tubes. Conclusion If the increase in output power is indeed proven to work in any amplifier, we do not want to claim this here. It would mean improve s