Klipschguy Posted January 20 Share Posted January 20 The exact year I do not know but it seems like a bunch of AAs from the 70s are ferrous (some I have checked first hand, some as reported by members of this forum). My brother’s 1950s Khorns use brass machine screws in the 500-5000 crossovers, so the impact of ferrous metal was well known to Mr. Klipsch. I would be interested in what Jim has to say as his available resources far exceed my own. BTW, 001 posted a link to the AA ferrous screw thread, but it doesn’t seem to be there now. Respectfully, Andy 1 Quote Link to comment Share on other sites More sharing options...
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