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Old 12th June 2013, 10:10 PM   #11
tomchr is offline tomchr  Canada
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Originally Posted by JFace View Post
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.

Modulus-686: 240W/8Ω @ <0.00025% THD. Modulus-86: 40W/8Ω @ 0.000054% THD. DG300B & Other Tube Circuits.
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