☆JRC New Japan Radio 4558DA [1569] Made in the 1980s☆ ＜ Used / Tested ＞ ・Used parts removed from 80s sound equipment (with solder marks), and I selected and tested those in good condition. JRC4558 [1XXX] series, the latter half of the series, has no plating on the lead wires, so slight oxidation is visible due to early manufacturing. Please refrain from purchasing if you are sensitive to this. ・Operation confirmed with my equipment (±12V) operating circuit. ・Please view all the images. Please perform op-amp replacement and equipment modification at your own risk. Thank you for your understanding as a vintage part. #OpAmp #ElectronicComponents #Effecter