Kenwood KT-5500 Mod

Discussion in 'Tuners' started by kwape, Oct 17, 2015.

  1. kwape

    kwape AK Subscriber Subscriber

    Messages:
    906
    Location:
    plymouth MA
    I've had this tuner hangin' around and put an order in to try out this mod. Here's a link to it http://www.fmtunerinfo.com/DIY.html#KT-5500

    I have the caps ordered and will be giving the unit a complete recap. But I have a dumb question on the diodes.
    "D 6 and D 7 diodes switched to Schottkys" I just took a guess at which schottkys diodes I need. I don't have a schematic and don't know what the original diodes are.

    I ordered these:
    http://www.mouser.com/Search/ProductDetail.aspx?R=SB160-Tvirtualkey62110000virtualkey621-SB160-T
    &
    http://www.mouser.com/Search/ProductDetail.aspx?R=1N5822virtualkey51120000virtualkey511-1N5822

    If anyone has tried this mod or has a recommendation, I'd rather be safe then sorry.
     
  2. 39cross

    39cross AK Subscriber Subscriber

    Messages:
    908
    Location:
    Beverly, MA
    From what I've read, 100V Schottkys are recommended. Perhaps something along the lines of MBR1100RLG or SB1H100-E3/73.
    Hopefully someone can come along and confirm this, or suggest alternatives.
     
  3. kwape

    kwape AK Subscriber Subscriber

    Messages:
    906
    Location:
    plymouth MA
    I grabbed the SB1H100-E3/73 diodes and it works fine. thank you for that. I recapped the unit with nichicon KZ, KL, elna silmic II, wima film. Following the recommended upgrades and replacing the rest. It is a noticeable improvement, about as good as a tuner of this class could sound. I would guess I spent 30-35$ on this.



    001.JPG 002.JPG 003.JPG 004.JPG
     
  4. 39cross

    39cross AK Subscriber Subscriber

    Messages:
    908
    Location:
    Beverly, MA
    That's great! Thanks for posting the photos.
     
  5. Spenser

    Spenser AK Subscriber Subscriber

    Messages:
    149
    Location:
    Pittsburgh, PA, USA
    I am about to do similarly on my Kenwood KT-5500. Have you or others had experience with other routine modifications suggested on the 'fmtunerinfo' site? Raise the transformer from the chassis using rubber grommets? Snubber circuit? Do you recommend?
     
  6. Spenser

    Spenser AK Subscriber Subscriber

    Messages:
    149
    Location:
    Pittsburgh, PA, USA
    In looking through what I could fine reference the aforementioned (Post #5 by yours truly), "fmtunerinfo" site "snubber circuit": it seemed judicious to post a reply to my own inquiry here due to what appear to me to be potential hazards. Sorry about this hijacking-sort-of revival of your nice thread. The Schottky diode choice advisory -- and the photos -- were very helpful to me as I went about putting together my own re-cap BOM!! Thanks again.

     
    Last edited: Sep 9, 2017

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