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Great Site Dan ...

The curves for the tubes I've measured mirror my own findings. Note how much better tubes work at higher current ... higher gm, lower rp, greater linearity. Note also how important a more horizontal load line is for some tubes, especially if high voltage swing is required. But all of this has to be taken in the context of the load presented by the next stage / OP TX etc and the drive of the preceding stage. I think this is where some draw, not wrong conclusions but incomplete ones when they describe the sound of a particular tube in comparison to another or at particular operating points.

Naz

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