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Fuse blows when biasing


frankphess

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Recently acquired a pair of Cary SLM-100 monoblocks. They play music, however when I try to dial in the bias, the 1/2" amp fuse blows while turning the bias screw. It blows when the meter reaches 70-80 mA, as they are supposed to be biased at 175mA per matched quad of KT-88's. I've gone through about 6-7 fuses and just can't get to 175 before the fuse blows. One amp seemed to work fine, then it too started doing the same thing. Any suggestions?

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