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RE: One is not limited to 12at7




The 12ay7 is by far the most linear tube of the bunch.

Pick a spot. The datasheet says 250vdc plate at 3ma. and -4vdc bias.

Load it high for a near horizontal load line. Nice even spacing between grid lines and the plate voltage moves very close to the same going to the left vs. going to the right.

With a horizontal load line I see (very close to) the plate voltage moving 87.5 volts from -4 to -2 volts grid and (very close to) the plate voltage moving 87.5 volts from -4 to -6 volts grid. If true in practice, that means that there is (very close to) no harmonic distortion.

The plate resistance is high but I don't think that would be a problem driving a pentode (pentodes don't have much Miller capacitance to worry about driving).


Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"


Edits: 09/24/16
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