Rotel model RA-920AX receiver. Seems to run great, but every few weeks it
blows one or both speaker fuses (4A). Completely random, just blows them
whenever it feels like it, sometimes one fuse, sometimes both. My guess is
that it's trying to feed a pure DC signal into the speakers, but I can't
figure out why. There's only one IC in the unit (NTE858M), used in the
pre-amp section, could this be the trouble?
Any advice would be appreciated.

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