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Old 5th February 2011, 09:29 AM   #1
gruni is offline gruni  Germany
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Default Are these 2SC5198 fake?

Hi everybody!
I need replacement transistors for some amps. So are those originals: 2SA1941 2SC5198 TOSHIBA High Power Audio Transistor,x10 bei eBay.de: Components (endet 27.02.11 03:13:26 MEZ) ?

Or is it better to replace them with "isc" ones?

Hope you can help me! I don't know what to look at when identifying original transistors.
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Old 5th February 2011, 09:53 AM   #2
jaycee is offline jaycee  United Kingdom
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Honestly, the picture could be of the real ones, and then they will send you fakes. It is not worth the risk to buy such devices from eBay.

ISC = cheap Chinese copies that are nowhere near as good as the originals.

You could try Fairchild's FJA4213/FJA4313 which are their clones of 2SA1962/2SC5242, or Onsemi MJW3281A/MJW1302A or NJW3281G/NJW1302G. These are all good quality audio output transistors with similar specs that should work very well. Fairchild will sell you parts direct, although you should have no problem getting any of them from a good supplier.
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Old 5th February 2011, 10:00 AM   #3
gruni is offline gruni  Germany
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Quote:
Originally Posted by jaycee View Post
ISC = cheap Chinese copies that are nowhere near as good as the originals.
not good in sonic quality or will they fail earlier?
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Old 5th February 2011, 11:13 AM   #4
jaycee is offline jaycee  United Kingdom
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Originally Posted by gruni View Post
not good in sonic quality or will they fail earlier?
They usually lie about the ratings, and so they just fail, either straight away or after a small amount of use.
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Old 5th February 2011, 11:21 AM   #5
gruni is offline gruni  Germany
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Quote:
Originally Posted by jaycee View Post
They usually lie about the ratings, and so they just fail, either straight away or after a small amount of use.
i have an amp with the output transistors already replaced with isc ones (also 1941/5198) which is running fine for half a year now. perhaps those remakes arent that bad...

i asked some german supplyers if their toshiba transistors are original. lets see, perhaps i can get some.
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Old 5th February 2011, 11:28 AM   #6
jaycee is offline jaycee  United Kingdom
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OK - but the transistors I mentioned should be perfectly fine as substitutes also
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Old 5th February 2011, 11:45 AM   #7
gruni is offline gruni  Germany
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i'll keep it in mind but i'd like to replace the transistors with the original types.

another question: i got one amp that someone already tried to repair. the output transistors were replaced by the ones on the photo. whats that brand? or are they just very bad toshiba fakes?
Attached Images
File Type: jpg transistor.jpg (160.7 KB, 571 views)
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Old 5th February 2011, 02:17 PM   #8
HighTec is offline HighTec  Croatia
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Quote:
Originally Posted by gruni View Post
very bad toshiba fakes?
Definitely fakes. It wouldn't surprise me if it's a BU die in that case. Since the transistor is dead , carefully smash the case with a hammer and post some pics here. Let's see what's hiding in there.
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Old 5th February 2011, 02:56 PM   #9
jaycee is offline jaycee  United Kingdom
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Probably just poor quality transistors - however, I consider them fake if they claim they are a particular Toshiba/Sanken/other type, and yet don't perform to the specs of the original part.
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Old 5th February 2011, 04:56 PM   #10
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Hi Jaycee,

About these Fairchild FJA4213/FJA4313, I have tried looking for them for a while but never able to do so. Could you please point to me where I can get them? Sorry for disturbing.
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