Also: I wanted to share with you guys Donald's thoughts about the 2A3B/2A3C comparison:
"For tubes, the Shuguang 2A3B precedes the 2A3C, but I wouldn't say the 2A3C is better. The 2A3C uses the same larger glass envelope as the 300B and I believe also uses the same larger plate structure, whereas the 2A3B uses a more traditionally sized glass envelope and plate size. Coincidentally, someone today [already a couple of weeks ago] on Audio Asylum posted a comparison of the two and prefers the 2A3B:
"I would say the 2A3 influences the sound the most, followed by the choice in rectifier, then input tube. I operate all the tubes conservatively, meaning their derated from their maximum plate dissipation. Doing so increases tube life and I believe provides a more enjoyable sound. Most 2A3 speaker amplifiers operate the tube at maximum plate dissipation (15 watts) to get the full power from the tube. With most headphones you don't need the full power capability, so I operate it around 70% dissipation."
Very. Cool. Stuff. :D