Sometimes, MFJ has a quality control problem, particularly with soldered joints. After first talking with tech support, I'd do a little snooping inside and see if anything is obviously loose or otherwise defective.
Can you receive signals on the various bands? Can you make the signals change in loudness (or make the background noise change in loudness) as you adjust the L and C combinations? If you can, that would seem to indicate that at least SOMEthing is working right...
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