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official upgrade from manufacturer!
They changes the tube and some components in output stage making it more powerful
Sorry, is it a new model or an upgrade program for existing amps? Link for more info?
It's a new model but the base design still remain unchanged, we also can send in our Phantasy for the upgrades.
According to them, it's called "the new version" and power has been increase 20% due to the specially chosen vacuum tubes and increase the capacitors.
I quite tempted to send in mine for the upgrade as I'm very impressed with this amp personally.
Phatlab Phantasy 新版 真空管隨身耳擴圖輯
Hmm, interesting. I haven't felt mine to be underpowered for my needs so far, but it's tempting.