Next time at the boneyard, I'll find some E30 with the radio out and harvest some of the jacks that insert into the back of the unit, the speaker wire jacks, and any other that might be useful. Would make a bench test easier. This is a perplexing problem, I'm surprised that it's such a bugger to get to the bottom of.

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cmac

I saw a few die of hunger; of eating, a hundred thousand. - Ben Franklin