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This is a hybrid (tube pre, final solid state) amp with about 120 watts. It has a (external) primairy fuse of 1A. But also two (internal) secondairy fuse for the two different voltage (coded AT and BT) feeding the tube pre stage. The fuses are placed before the rectifiers. The value of these two fuses is unknown to me. Can anybody tell how to find (calculate?) this out.