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Wattage Graph

Here watts against input signal level is displayed. The red plot is what will hold most users' interest, as it displays the power output of the output stage.

A useful test is to plot maximum potential output wattage against the number of triode pairs, as this test reveals how many triode pairs are needed to optimally match a particular load impedance.

The yellow plot displays the class-A operation boundary, below which the amplifier is operating class-A mode.

I & V Graph

Here output current and voltage against load resistance is displayed. Just as we would expect, the higher the load impedance, the greater the potential voltage swing, but the lower the potential current swing.

Selecting a Plot

In the above graph, it is hard to make out what the yellow plot line's values are, as the plot is so flat. The solution is easy enough: either hover the mouse cursor over the plot to read its Y and X values at the bottom of the program or press down the "Marks button at the bottom left of the graph to see value markers or click on the plot line to have the graph zoom to the plot or use the zoom tool (the magnifying glass with a plus sign in it); of course, all four can be used at once.

TCJ Push-Pull Calculator Graphs

Having a circuit simulation's results gift wrapped on the "Results" page makes for an easy and quick evaluation of what you have in hand. Like a geographical positioning device, it tells you where you are, not where came from, and more importantly, where you could be. Which is better more tubes or more B+ voltage? When does the law of diminishing returns take hold in you OTL amplifier design, e.g. would 20 tubes really be that much better than 16 tubes? The only way to find out is to perform multiple tests, varying the key variable(s), tabulating the results from each simulation. Or you can let TCJ Push-Pull Calculator do it all for you. Built into the program is an array-variable functionality. You decide which of eight variable to change in value with each simulation. Then the array of results are displayed in four of the seven graphs.