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Thread: Kenwood TS-530S Hybrid arcing under driver tube

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  1. #5
    Beach Bum KA2PTE's Avatar
    Join Date
    Aug 2020
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    Veryork
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    69
    Just put the board under the magnifier again, and I saw some black stuff
    between Pin7 (the plate) to the common foil.
    I scraped at it and now theres a tiny groove you can see in the pix if you
    zoom in.

    As I rubbed on the nearby ground foil it started to expose the copper
    foil...there is a layer of some stuff coating lots of the boards in this
    radio , probably niccotine as it was likely owned by an ex smoker. So maybe
    its become conductive near this area of the tube and the voltage potential
    ignited it, and ate up some of the board.

    They did put that pin pretty close to the ground plane in the design.
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