Originally Posted by JFace
Is that the quick and easy equation? I've always used:
A = (u * Plate load) / (Plate Load + anode resistance + Cathode resistance*(u + 1))
Yeah. It's the quick and dirty equation. In practice, the gain will be slightly lower than Rload/Rcathode as the gain of the tube isn't anywhere near infinite.
I tend to take an intuitive approach to circuit design. I make a couple of quick back-of-the-envelope calculations to get started and throw it into a simulator for the finer detail. I follow that up with the final optimization in the lab. For most work, the quick & easy equations get you close enough.
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