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Live Curves
The tube curves that SE Amp CAD displays are entirely mathematically derived, which means that you can specify the both the maximum current and voltage of the graph along with the number of grid lines and the voltage step increments. Push button switches toggle the display of the load line, and the IV dynamics of the output stage. SE Amp CAD knows what both the plate voltage and current along with the grid voltage is at any point on the graph. (Download a free sample of Live Curves technology from our Tube of the Month page.)
Transfer Function: I or V
Here the deviation from linearity is easily seen. SE Amp CAD can plot the plate voltage or plate current's transfer function into the primary's impedance across the peak to peak voltage swing of the output tube's grid.
Plate Curves
Here the constant plate voltage increments are plotted against sliding grid voltages. This is a less common way to display a tube's dynamic characteristics, but in may ways it is the better way to do so, as the curvature of the load is an easier read out of non-linearity than the straight load line against the variable grid curves.
Grid Curves
This is the usual tube manual plate voltage/current graph. Here the change in plate current with constant grid voltage increments is plotted against an increasing plate voltage.
V & I & W Limits
SE Amp CAD can superimpose the voltage and current and wattage limits of a tube over the plate or grid curves. These lines set the safe use bounds for a tube's operation.
Live Tube Data Readouts
SE Amp CAD reads the mouse's cursor movement across the plate curves and displays the tube's grid voltage, plate voltage, plate current, rp, mu, Gm, and plate dissipation at the cursor position on the graph. As the cursor is moved, the tube data are updated and displayed.
Bitmap Copy Creation
SE Amp CAD features easy screen captures of the oscilloscope traces by creating bitmap files (*.BMP), which can be stored on your hard drive and used in other programs and easily printed.
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