The document also has comments about OTLs that I don't agree with, as it comes from the 1950s. But the UL stuff it has in it, while obviously biased (if you will pardon the pun) is representative of the general technical/engineering understanding of ultralinear operation- its easy enough to find plenty more articles like this one. I just clicked on one of the higher-page hits on Google. I can find some of the stuff on the UL curves and that bow I mentioned if you are interested.
For the most part the Japanese seemed to justify our stance on triodes, which we have used since the late 1970s. Back then, people thought triodes were 'quaint' (I suppose many still do). These days they have a lot more acceptance.
Full credit and abundant praise must be given to the persistent courage of the Japanese in regard to the triode tube amplification renaissance. Many of us, AtmaSphere included, reap the benefits.
For the most part the Japanese seemed to justify our stance on triodes, which we have used since the late 1970s. Back then, people thought triodes were 'quaint' (I suppose many still do). These days they have a lot more acceptance.