Hey-Hey!!!, Just remember, it is easy to question something like this super 2A3. I'd rather see a valve that doesn't have to ride on any other valve's use. Perhaps one which could be sub'd with minimal or no fuss...but one that enough different to require another name.
A 40W 2A3 is the 300B, but with lower voltage filament. This bigger tube should have a bigger filament, perhaps even a thoriated one...:) Imagine a 2A3-ish that glowed yellow/white like an 845, all at 2.5 V. Now that would be one HD filament, no? cheers, Douglas
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