Listing is for a set of 4 pieces. Dual Operational Amplifier This is a selected version of the NJM4580D, chosen for lower noise. ● Appears to be used in ROLAND S-770 RAS-770 (based on buyer information) This is a selected version of the NJM4580, chosen for lower noise. ■ Although these are unused original items, they may have been in stock for a long time, and the printing may be faded, the pins may be bent, or the metal parts may be oxidized and discolored. Please refrain from purchasing if you are looking for brand new, pristine items. ■ The LOT# etc. in the photos may differ from the actual items. If you are concerned, please contact us before purchasing, and we will investigate and respond. Also, the quantity and packaging method shown in the photos may differ from the actual listing content. If you want more, please contact us. ■ Items paid for by 4:00 PM will be shipped on the same day (excluding Saturdays, Sundays, and holidays. We do not ship on Saturdays, Sundays, and holidays). ■ Domestic procurement. ■ We do not negotiate discounts. Also, we cannot change the set quantity, for example, changing a set of 2 to a set of 1. ■ An invoice will be attached. JRC Dual High Current Operational Amplifier IC NJM4580 Marked "4580D" 4 pcs/set A lower noise version of NJM4580 ● Used in ROLAND S-770 RAS-770, according to the customers and service manual Procured in Japan Original, new and not used