Atmasphere, "the original patent shows that if the tap is correctly placed, you get exact triode linearity with 90% of pentode power."
The industry has chased this promise since the 1950s. If the patent Ralph referenced is the same as I'm thinking, it was filed by those who formed Dynakit; their own products (and I'm a devotee), which obviously had full use of the technology, certainly missed out on realizing the aforementioned claim.
At any rate, since the early 1960s, high-end audio more or less abandoned pentode operation. During "the age of progress", so many entered into building UL amplifiers for nothing more than to put forth ad copy deemed required to keep themselves current.
Most of the time, those in this hobby who mention pentode actually mean ultralinear...
The industry has chased this promise since the 1950s. If the patent Ralph referenced is the same as I'm thinking, it was filed by those who formed Dynakit; their own products (and I'm a devotee), which obviously had full use of the technology, certainly missed out on realizing the aforementioned claim.
At any rate, since the early 1960s, high-end audio more or less abandoned pentode operation. During "the age of progress", so many entered into building UL amplifiers for nothing more than to put forth ad copy deemed required to keep themselves current.
Most of the time, those in this hobby who mention pentode actually mean ultralinear...