Recently my MFJ tuner was giving me wrong readings. My Radio show 100W while the MFJ only 40W or so. After several testings that included replacing the coax cable, checking the connectors and the antenna the problem was not solved. A quick search online provided me with a possible solution.

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The detector diodes are D1 and D2, and they are both
1N34A's.

I replaced them both an now my MFJ is like new.

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