I found a possibly useful description of the difference between ultralinear and triode modes for pentode tubes, or valves as we still generally call them here in the UK.
Bear in mind that the N3 Pro uses the tubes as a buffer stage, and is followed by an op-amp output stage, hence why there is no significant (if at all; can't remember the specs) difference in output power between the two tube modes, contrary to the theory which states that a pentode operating in triode mode will output significantly less than when in ultralinear mode.
I'm no tube expert, come back in 10 years when I will have grasped the basics, so can't answer any specific questions but thought this post from the Steve Hoffman forum offered quite a good basic explanation, since there were a couple of queries about this topic here a few pages back.
Bear in mind that the N3 Pro uses the tubes as a buffer stage, and is followed by an op-amp output stage, hence why there is no significant (if at all; can't remember the specs) difference in output power between the two tube modes, contrary to the theory which states that a pentode operating in triode mode will output significantly less than when in ultralinear mode.
I'm no tube expert, come back in 10 years when I will have grasped the basics, so can't answer any specific questions but thought this post from the Steve Hoffman forum offered quite a good basic explanation, since there were a couple of queries about this topic here a few pages back.
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