Hills Prolink 1B TV distribution amplfier

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  • japlytic
    Badcaps Legend
    • Oct 2005
    • 2086
    • Australia
    #1

    Hills Prolink 1B TV distribution amplfier

    Today, I bought a Hills Prolink 1B TV distribution amplifier made in 1992 and when I was testing it, I got a lot of hum.
    So I decided to replace both electrolytic capacitors (the original 470uF/25V Samwha unit before the 12V regulator measured at about 49uF) with an upgrade of the 470uF/25V unit to a 2200uF/25V unit (it had a higher capacitance density than the original) along with the 10uF 35V low leakage unit on the 12V rail being replaced with a 22uF 16V tantalum unit.

    This fixed the problem and the amplifier still has a good noise figure.

    Could this unit have been in a hot area, such as in the roof space?
    Heat apparently causes MATV equipment to fail, especially those with switching power supplies.
    My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.
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