Oldest DOD FX55 Distortion I've ever repaired !

Discussion in 'The Effect effect' started by vid1900, Apr 17, 2019.

  1. vid1900

    vid1900 Most Honored Senior Member

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    Guy brought in a FX55 that has the super old rubber footswitch cover (rather than the latter plastic molded switch).


    IMG_20190417_145313178.jpg
     
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  2. vid1900

    vid1900 Most Honored Senior Member

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    Serial number FX103773, so I assume it's within the first ~3000 pedals that DOD ever built in America. (I seem to remember reading that they started with serial 101000)


    Note that "distortion will be present when battery is depleted" (or even if the battery is brand new)
    IMG_20190417_145409633.jpg
     
  3. vid1900

    vid1900 Most Honored Senior Member

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    Guts date it to 1982. The production date sticker inside only says "22" with the month and year missing for some reason.

    Super clean, I was the first person to service it in 37 years.

    IMG_20190417_145628095.jpg
     
  4. Grux

    Grux Strat-O-Master

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    Thats cool and yeah its in great shape for sure! Was that how the knobs were set? That made me laugh :p
     
  5. vid1900

    vid1900 Most Honored Senior Member

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    You know that's exactly how it was given to me, lol
     
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  6. CB91710

    CB91710 No GAS shortage here Double Platinum Supporting Member

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    When I was in my teens and 20s, everything was dimed.
    Distortion, compressor... and yes, it was the 80s, so chorus....
     
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  7. vid1900

    vid1900 Most Honored Senior Member

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    Jay asked me in an email "What was wrong with it?"

    I guess that would be a natural question, lol.

    1. The 9v battery clip had disintegrated (probably too many corroded batteries over 40 years) . That got replaced with a heavy duty plastic cap one.

    2. The pedal would just "fart" rather than have a sustained distortion.

    Scope-ing it out, one of the electrolytic caps was "open".

    I did not have any bright yellow caps in-house, and installing a modern, smaller, black cap would look like it was obviously repaired.

    I installed a Rubycon on the trace side of the circuit board, leaving the dead, yellow cap up on top.

    Sounds insanely gutsy (with the distortion knob set at 11 o'clock).
     
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