This bass and treble control only attenuates the corresponding signals, requiring further amplification. R1 and R4 are 2.2 M-ohm. R2 is 390k, R3 and R5 are 100k. The capacitors are: C1 and C2 of 270pF, C3 of 680pF. R6 is 2.2 M-ohm. The circuit must be coupled to a very high input impedance stage, preferably with FET.
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