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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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Sumitomo Transistors any good?
Hi all, Can anyone please help me? I am working on a Crest 1400 power amp. I replaced all 6 pairs of b600/d555 outputs (1 chan). The amp played fine for 10 minutes at low volume then I cranked it up (scope showed music appx 60vpp into 4 ohms) then the same channel blew again. this time the pair of 2sa1006/2sc2336 (to220's) shorted too but the drivers 2sa1302/2sc2381 were still good. All other parts seem ok too. I used Sumitomo brand transistors not NEC. So the question is... Can anyone say good or bad about that brand? Or was there something else that I missed? Where can I get good INEXPENSIVE substitutes or must I use only the NEC's? Where can I get the NEC's cheap? the NEC's at MCM is about $8 times 12 pcs plus tax plus shipping!! Thanks a million in advance... baffled and disappointed |
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