mikoss
1000+ Head-Fier
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yay, redacted.
I wonder if they just meant the less common metal tubes instead of glass tubes? That's kind of what they look like.
A little poking around seems to indicate to me that they may in fact be FET tubes. To my understanding you could setup a dual-FET or MOSFET "tube" with bipolar current running into it and it would function similarly to a triode, but with benefits of both tubes (harmonic distortion curves) and SS (lower distortion, more linear, more power, etc.) I have used some old mics that were setup similarly, with the dual-FET circuit simply standing in for the tube. Just speculation. We'll see what people say about the sound!
For the curious that missed it: