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Single Ended Triodes (SETs), the ultimate tube lovers dream.

RE: Ultralinear patent

To my understanding, yes, a number of manufacturers used slightly different taps with as little as only 2% difference in order to get around the patent. This results in a bowed curve.

Of course the tap values must be different depending on the tube; tubes being different from one another and all.

Your Tung Sol reference does not specify what UL was used, only that it was UL. The curves I've seen when the taps are set up properly look very much like a triode. Apparently though the family of curves you get varies quite a lot depending on the tube.

Since Arco controlled the patent and Hafler later went to Dynaco, I find it amusing that he knew how to get around his own patent and proceeded to do so.

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