Figure 4, frequency response of high gain magnetic preamp. The precise values stated in the table below were obtained using the cursor readout provided in l t spice. This is a graph of frequency versus gain expressed in d b. The frequency is on the horizontal axis on a logarithmic scale. That is, the distance between 1 and 10 is the same as that between 10 and 100 and between 100 and 1 k etc. The frequency scale range is from 1 Hz to 100 kHz. Gain is plotted on a linear scale on the vertical axis. The range is from 12 d b to 72 d b.

At 1 Hz the value is 63.7 d b.
At 2 Hz it is 66.8 d b.
At 5 Hz, 68.0 d b.
At 10 Hz, 67.7.
20 Hz, 66.3.
50, 61.5.
100, 56.5.
200, 51.3.
500, 46.4.
1 k, 44.4.
2 k, 42.5.
5 k, 37.5.
10 k, 32.2.
20 k, 26.4.
50 k, 18.5.
100 k, 12.7.

This completes the verbal description.
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