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Thread: Kenwood KA 54 mod

  1. #1
    Join Date: Jul 2012

    Location: Telemark, Norway

    Posts: 122
    I'm Johan.

    Default Kenwood KA 54 mod

    I have found this amp in a container outside the electro-shop. After som tlc, it works fine. The phono preamp is made of one dual op-amp (6556), which makes me think about op-amp rolling. Do i have to change the surrounding parts (condensers, resistors) to get this right? Does anyone know about this 6556 op-amp?

  2. #2
    Join Date: Oct 2016

    Location: Bolton, England

    Posts: 1,381
    I'm Andrew.

    Default

    Here's the data sheet for the op-amp:
    https://industrial.panasonic.com/con...6_E_discon.pdf

    The pin-out on dual op-amps is pretty standard and it should be possible to swap it for another without having to make any other changes. However, personally, I wouldn't bother. The "op-amp rolling" trend doesn't impress me much. Sure, changing a cheap part for something better is a good idea but I suspect that most op-amp rolling is done with more of suck-it-and-see approach. It seems to me more like random changing of parts in the hope of finding something special.

    Still, it's cheap enough to have a go and you can always put the original part back in, assuming the op-amp is mounted in a socket. If the op-amp isn't mounted in a socket you will have to be a bit more careful. Desoldering an op-amp requires heating all the pins simultaneously to remove the part without applying so much heat as to damage the op-amp or damage the tracks.

  3. #3
    Join Date: Jul 2012

    Location: Telemark, Norway

    Posts: 122
    I'm Johan.

    Default

    Thank you, RothwellAudio. This was useful to me.

  4. #4
    Join Date: Aug 2008

    Location: Suffolk, UK

    Posts: 1,308
    I'm Paul.

    Default

    If you are careful you can cut the opamp out using a small hobby saw or hobby drill, so that you have just the 8 legs remaining. You can then either desolder these and then solder in an 8DIP socket or just try soldering the socket to the opamp legs.
    ~Paul~

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