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Re: well Piano man...

Using SE CAD and PP Calculator I can construct two circuits, one for SE and one for PP. Leaving aside transformer specs, which I cannot duplicate between the two programs, the results for 2A3s operating at Vp 250, 60mA, are interesting.

In SE, a 2.5K load nets 3.2 watts Po. A 1.6K load gets me 3.5 watts.

In PP, a 5K p-p load results in 7.2 watts Po. A 3.2K p-p load results in 9.2 watts Po.

So in SE, reducing the load 40% results in a 10% increase in Po. In PP, reducing the load 40% results in a 27% increase in power. Again, these numbers are surely affected by the programs' inability to take into account transformer specs, but it's interesting to see the difference. If in Class A PP, the tubes really saw Raa/2, wouldn't you expect the same results as in SE regardless of the load we applied? Mikeyb's measurements were done with a relatively low-powered circuit. What happens when we push the 300Bs into the 30 watt range? Would he get the same results, or does the model start to collapse?

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