Ibanez TS-808 Tube Screamer comparisons. Left to right - JRC4558D, NEC C4558C, Malaysia RC4558P. They all sound good, but the JRC chip has a bit more... | By DS Effects, LLC | Facebook
Boss OD-1 s/n 091900 (aug. 81) - chip NEC C4558C | Reverb Canada
Boss Sd-1: Mij, Mij, And Mit | The Gear Page
C4558C NEC JAPAN, DIP8. Pulled. Tested - Retroamplis
C4558C Datasheet - HIGH PERFORMANCE DUAL OPERATIONAL AMPLIFIER???? from NEC Electronics Inc.
10PCS UPC4558C C4558C HIGH PERFORMANCE DUAL OPERATIONAL AMPLIFIER DIP8 new | eBay
UPC4558C Original NEC Operational Amplifier | eBay