Do it by self with wiring diagram: simple 741 pre ampli circuit Low noise pre tone control circuit using 4558 Circuit bass 4558 subwoofer woofer booster circuitspedia
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do it by self with wiring diagram: Simple 741 Pre Ampli Circuit
4558 Ic Subwoofer Circuit Diagram Pdf - Home Wiring Diagram
5 Tone control (bass mid treble) circuits using NE5532, 4558, LF353