SKEMA: Bagian Preamplifier: P1_________________10K Linear PotensiometerP2_________________10K Log. Potensiometer R1, R2______________68K 1/4W ResistorR3________________680K 1/4W ResistorR4________________220K 1/4W ResistorR5_________________33K 1/4W ResistorR6__________________2K2 1/4W ResistorR7__________________5K6