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Old 13th August 2012, 03:55 PM   #301
neychi is online now neychi  Croatia
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Originally Posted by spurlte View Post
No, these are new ones from PacificSemi.com. They have 2sa968, but they sent substitutes, 2sa1302/2sc5200, for your 2sa1011/2sc2344 and I was taken aback by their physical size, T0-3P, compared to T0-220. The substitutes are 150watts with a base current of 2.0A at 200Volts. Much stronger, no?
Yes, much stronger. 2sa1302/2sc5200 (for output stage) are definitively not a substitute for 2sa1011/2sc2344 (for driver stage). 2sa1011/2sc2344 have only 25W. And one more thing, 2SA1302 is complementary with 2SC3281 and 2SC5200 is complementary with 2SA1943.
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Old 13th August 2012, 04:51 PM   #302
spurlte is offline spurlte  United States
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Originally Posted by neychi View Post
Yes, much stronger. 2sa1302/2sc5200 (for output stage) are definitively not a substitute for 2sa1011/2sc2344 (for driver stage). 2sa1011/2sc2344 have only 25W. And one more thing, 2SA1302 is complementary with 2SC3281 and 2SC5200 is complementary with 2SA1943.
Thank you. I saw that on 2sa1302's specs sheet. What was pacificsemi.com thinking? Funny thing, I now have a bunch of good 2sa968 from various places.
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Old 13th August 2012, 07:02 PM   #303
AndrewT is offline AndrewT  Scotland
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send them back demanding a full refund.
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Old 13th August 2012, 08:46 PM   #304
spurlte is offline spurlte  United States
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send them back demanding a full refund.
Yes, I agree. AndrewT, I am learning this whole new field--purchasing thru electronic project building. I said earlier that I am a retired nut who is watching other retirees dying left and right because they don't know what to do with themselves. " If you are what you do while working, who are you when you are not working?" If I lose a few dollars while learning this whole enterprise of electronics, so be it. I just ask for your patience.
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Old 13th August 2012, 10:20 PM   #305
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I wouldnt purchase any of the transistors on those pics, you should start the project troublefree, they are all cheap chinese fakes.
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Old 21st August 2012, 04:07 PM   #306
a.wayne is offline a.wayne  United States
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Can outputs MJL21193, MJL21194, be substituted with MJW1302/3281 ..?
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Old 21st August 2012, 04:37 PM   #307
AndrewT is offline AndrewT  Scotland
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the KSA started with MJ15003/4.
I would estimate that the MJL21193/4 are much closer to the originals than the MJW1302/3281
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Old 21st August 2012, 04:40 PM   #308
a.wayne is offline a.wayne  United States
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Yeah figured ....
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Old 21st August 2012, 06:59 PM   #309
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What is actually the motivation for substituting the MJ15003/4's with different devices? The MJ15003/4's have better thermal conductivity than TO264 devices which is pretty critical for this project. They are also almost everywhere available. Offcourse they have lower Ft, but I would consider that as a advantage, this will reduce chances of oscillation a bit more. Can someone explain which specific parameters are important and why?
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Old 21st August 2012, 07:13 PM   #310
a.wayne is offline a.wayne  United States
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I believe the current EBAY kit is using MJL21193, MJL21194 .....
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