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Parts for Roland Phase Shifter SPH-323 rackmount.
Small-size black rotary knob with orange line. Fits knurled shafts. Used on TR‑808, SPV‑355, RE‑501, DR‑55, CE‑3 and many other 1980s Roland / BOSS vintage units.
High-quality 4558 dual operational amplifier IC, selected and tested for reliable performance in vintage synthesizers, drum machines, and audio equipment. Fully compatible with a wide range of classic gear including Yamaha DX7, Korg Polysix, Wavestation, Lambda, EX7, DS‑55, Moog Liberation, and more. Ideal for restoring audio circuitry.