Contact Joe at JCAudio (jcaudio.com). He can answer any Kora-related question or guide you to the appropriate source.
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Possible causes. (1)Power switch on back not turned on.(2)Internal fuse blown. The Explorer has a "passive" pre-amp section. Tubes might be non-functional. Just opened mine up to tighten the bidding posts and funny don't recall seeing a fuse but all the reviews say there's one there. Great sounding int. amp! Are the two front LED lights on and does the tube glow in the window? Good luck. Bill