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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Eminence Grise
well noire rather than grise
I'm not geting a consistent story from the recording studio where these 2 Marshall MG250DFX came from, with Eminence 2x12 in each. One amp , one of the headers was partially disconnected for the power and signal to one TDA7293 PA. Would this be a possible scenario. TDA o/p driven to DC with loss of one rail and burns out one of the speakers but as music still coming from the other, not much thought about it at the time, perhaps reporting smoke/loss of power to someone at the studio. Then someone with the studio jumpers back-to-back that amp to the speakers of an exactly similar amp, and blows the mirror-handedness speaker of that combo.? First one seriously burnt up including part of the spider, but the second one barely had time to get warm before the wiring of the VC fused o/c so not even any scorching on the VC former , but a neat split. The first blown speaker due to intermittant DC and then the second full on DC drive? |
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