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 USED 3CX800A7s 

Discussion in 'Amateur Radio Amplifiers' started by AG6K, Dec 1, 2011.

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  1. AG6K

    AG6K QRZ Member QRZ Page

    ••• A Canadian friend recently purchased a used 3CX800A7. When he tried it in an amplifier he saw fluctuations in grid-current and power out so he began looking for answers. The problem was found when he performed the Joe Funderberg, W6IHA, Test and discovered that the amount of anode-cathode leakage-I changed when he changed polarity - thereby indicating that the tube had loose gold meltballs inside.
    • Rich, ag6k.
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