RC4558P opamp replacement

Discussion in 'Other Amps' started by fight, Dec 6, 2021.

  1. fight

    fight New Member

    Joined:
    Apr 24, 2017
    Messages:
    6
    Likes Received:
    1
    Hi guys,

    I have a Kenwood KT7500 tuner that has a noise(when it feels like it) coming from the opamp(traced the signal path before it and it goes away). My question is are there other op-amps that will take the place of the RC4558P that is there without modifying anything? When changing these, is there bias' that must be checked? Sorry, if I could get the concept of electronics into my head I wouldn't ask questions I guess. Thanks.
     
  2. tschrama

    tschrama Well-Known Member

    Joined:
    May 15, 2010
    Messages:
    1,475
    Likes Received:
    770
    Location:
    Netherlands
    It is a slow BJT input opamp with 8nV/sqrtHz input noise density. That is not that bad. Much better than a tl072. But I doubt that the opamp is the origing of the noise.

    you might try a NE5532
     
    PelliX and South Park like this.
  3. PelliX

    PelliX Well-Known Member

    Joined:
    Jun 16, 2020
    Messages:
    1,595
    Likes Received:
    2,963
    Any other 4558 of that type would do the job. Lots of myths about the magic of op-amps, but they're really very simple and do what it says on the tin (well, datasheet). @tschrama 's suggestions are fine, but I concur that it's unlikely to be the source of the problem. I take it the tuner is inline? What about bypass? What type of tuner? How is it powered?
     

Share This Page