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INPUT
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There are two input of HIGH and LOW, as for HIGH input impedance as for 1M and LOW input impedance becomes 136k, furthermore - it is the typical circuit which becomes 6dB.
J1 * HIGH input and input impedance 1MΩ J2 * LOW input and input impedance 136kΩ, furthermore - 6dB R1 1M Grid bias resistance R2 68k Noise prevention of high frequency R3 68k Ditto