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Audio Power Transistors - Buying in Bulk

dank123

Hi All,

Does anyone have a solid opinion on the quality of Multicomp Pro MJ15003 and MJ15004 power transistors (Newark# 76AH5818 and 76AH5819)? I want to stock up on these parts as I use them quite a bit and the Multicomp Pro ones come in at about half the cost of the other name brand devices. I use these parts for vintage audio amplifier repair and the occassional amp build from scratch. Not exactly critical applications, but I'd like to get some assurance that they are at least worth the money. Otherwise, I may as well just spend the extra and get ONSEMI. Has anyone tested this Multicomp Pro transistors to see what conditions they fail under as compared to the ONSEMI ones? 

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  • 0

    There's less information on those devices, hence the low-cost. But the physical chip inside will still be made in the same factories that the branded parts are made in, it's not possible to manufacture semiconductors in lower-quality at a cheaper factory, it's a binary thing.

    However, I think if you ask your audio customers which part they would want inside their repair or new product, they will want the branded part every time.

    Every time I do an audio-related repair for anyone, I've stopped asking which parts to use.. I simply use branded parts, top-quality (or thereabouts!) ones, and just pass the cost on. No audio customer wants to know that they got the cheaper unbranded parts inside their product.

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  • 0

    There's less information on those devices, hence the low-cost. But the physical chip inside will still be made in the same factories that the branded parts are made in, it's not possible to manufacture semiconductors in lower-quality at a cheaper factory, it's a binary thing.

    However, I think if you ask your audio customers which part they would want inside their repair or new product, they will want the branded part every time.

    Every time I do an audio-related repair for anyone, I've stopped asking which parts to use.. I simply use branded parts, top-quality (or thereabouts!) ones, and just pass the cost on. No audio customer wants to know that they got the cheaper unbranded parts inside their product.

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  • 0 in reply to shabaz

    I agree.

    It is so I can keep a large stash on hand for my own stuff and I don't care about the name as long as they work equally well compared to the more expensive ones.

    So you're saying one factory makes all the internal chips and then separate factories make the metal casing and stamp their own brand on them, but put those same chips inside?

  • 0 in reply to dank123

    The internal die (chip) is made in the same factories, i.e. identical quality level, but you won't know which specific transistor that it electrically matches 100% (short of cutting one open, and taking a high-res photo and then comparing with others that might be similar). The wiring (bonding) and encapsulation may well be the same factory too, or may be different (no way to tell that).