BjarneAndersen
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Posts posted by BjarneAndersen
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Many thanks for your reply, I will now try to make some new coils after the drawing.
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Sorry for my bad English i am from Denmark.
I have restored my old AR9LS from 1983. Rebuilding the crossover to AR9LSi with new capacitors and re foaming the 10" 12" 8" speakers.
Now I've discovered that the 3/4" tweeter are blown in both speakers and no one on E bay for sale.
I bought some 0,12 mm. copper wire and i will try to make a new coil at 4 ohm.
Has anyone tried it?. Or someone who knows if you can take a coil and dome from another AR 3/4" tweeter that fits in the original?.
AR9LS 3/4" Tweeter restoration
in Acoustic Research
Posted
I managed to make 2 new coils in two layers, first layer in 12½ turns and second layer in 11 turns.
But there is something strange for, according to the original drawing, the coil should be between 3 to 3.7 ohms.
I measured the old wire with a micrometer screw to 0.12 mm and a length of 1.65 meters and measured it to 4 ohms.
The new coil is also made of 0.12 mm. wire 1.65 meters long and measures 4 ohms.
I don't know if they just had a bad day at the factory when they made it. But I am currently satisfied with the result.