Tube DIY Asylum

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Only needing 3 volts RMS makes it easy and the CCS presents a very high impedance load for the tube resulting in a horizontal load line. That tube can be operated at a lot of different plate current levels and remain linear because of the horizontal load line.

As long as the spacing between the grid lines is equal, following the load line, then the tube is not producing harmonic distortion.

It's not about the straightness of the grid lines on the plate curves, it's about the spacing between those grid lines following the load line.

You have to plot a load line. If there is no load other than the CCS (as in your first stage) then plotting a load line is easy. It's just a horizontal line with the operating point (voltage and current at idle) sitting right in the middle of it.

The load for your second stage is the 220k grid resistor of the next stage. That is in parallel with the impedance of the CCS which is so high of an impedance that you can ignore it.

Tre'


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


Edits: 04/20/24

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