Cleaning Ceramic Trimmers

Discussion in '"Boat Anchor" & Classic Equipment' started by KW4H, Oct 21, 2021.

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  1. KM1H

    KM1H Ham Member QRZ Page


    You got your tarnishes mixed up. The black type is silver sulfate which is not conductive but is an extremely thin deposit and when disturbed generates the noise when a tiny clean spot makes contact.

    Carl
     
  2. KM1H

    KM1H Ham Member QRZ Page


    I wouldnt use that solution on any thinly plated object, its too risky.
     
  3. KM1H

    KM1H Ham Member QRZ Page

    Not all ceramic trimmers are the same. The failure mode can be the silver is worn off which doesnt happen with quality trimmers as used in HP and other test equipment and other quality electronics.

    Most are not used in circuits with a voltage other than the ~ microvolt RF, no DC involved. The Centralab temperature compensating ceramic trimmers I used and tuned over many decades havent worn out yet. Old TEK scopes and other gear, plus HP and other high end gear have loads of them to salvage.

    Cities or farms, it makes little difference these days, most all have some degree of pollution; coal and oil burning power plants 1000 miles + away carry it 24/7 as well as an upwind plant in the next county.

    Farms and industrial areas emit various foul odors causing tarnish. No aircraft is pollution free either and even the little put puts run a straight exhaust

    As Pete mentioned silver migration is another well known source of noise problems and the surface used on is quite varied. Washington DC is also known for air pollution:p:eek::rolleyes:
     

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