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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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Counterfeit semiconductors again
A new low.
Harman Kardon HK-3370, original output transistors (never been previously changed) were Chinese fakes. They didn't even bother to make the lettering, logo, etc look the same or show the same hFe group. Busted them open, the NPN's and PNP's even had different internals, die size was different, one had RTV over the die, the other not. The numbers were 2SC3856 and 2SA1492. I've dealt with many original Sanken devices - these weren't. Good job as usual, Harman. Of course if Harman were a legitimate manufacturer, instead of outsourcing everything for more than the past 25 years, things like this might not happen, eh? Mark Z. |
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