Hadn't seen that - very cool! I look forward to the specs. When they are available, I'll see what changes are called for to optimize the Paramount.
I'll just note that if you plug it into an existing amp, you will reduce the distortion because of how the operating point shifts, and the speaker damping will also change - not surprising that there would be an audible difference in sound!
Now if he makes a 2A3 version ...