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SE Amp CAD divides the results of its calculations into several groups: those that pertain to the output transformer; those that pertain to the output tube; those that pertain to the maximum ratings output tube; those that pertain to the current-voltage relationships that the output stage will experience because of the specified input voltage swings; those that pertain to the output stage (output tube, cathode resistor and bypass capacitor); and those that pertain to the load being driven by the amplifier. As circuit variables are changed, SE Amp CAD updates the display of the results, making it easy for the amplifier designer to inch his/her to the desired outcome. After a change in value of a circuit variable, those results that are determined in part by that variable are displayed in a fuchsia color, until the "Calculate" button has been pressed, which will restore the font color to aqua. If an error condition, such as excessive plate dissipation, the result's font color turns to red and returns to aqua when the problem has been corrected.
Circuit variables, such as tube type, B+ voltage, cathode resistor values, and grid voltage values are entered in field boxes at the left or changed by clicking the increment controls at the field box's left. The results are then displayed at the program's right.
The increment buttons serve to increase or decrease the value in the corresponding edit field boxes by 1 or 10 or 100 or 1,000 units, depending on the variable being adjusted. For example, the smallest increment for the grid voltage is 1 volt, but for the primary impedance the smallest increment is 10 ohms.
When entering large values directly, such as, 105,000 the easier entry method is to type "105" and then "k." Similarly, if entering 1,100,000, the quick way is to enter "1.1" followed by "m."
Output results can be displayed in either RMS or peak values. On older (i.e. slower) computers, the voltage/current resolution can be decrease to speed result processing.
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