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Old 25th October 2002, 02:27 PM   #1
MGR is offline MGR
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Smile Fake Transistors

I would like to know where to buy genuine Sanken Transistors namely 2SC3264 and 2SA1295.I have tried to buy them locally in our country(Philippines) but they are all fakes,they are all underrated.I even pried open 4 transistors only to find out that the chip is so small.Operating this transistors even on moderate voltage (60 volts) will blow them.I would appreciate any help.

MGR
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Old 25th October 2002, 08:26 PM   #2
djdan is offline djdan  Romania
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Can you post a photo for this tranzistors ?

I have an amplifier with 4 this tranzistors and work very well for 4-5 years at 400w/4 ohm and time to time at 550w/2ohm for short time , no more 30 minute.

The original Sanken are made in MT200 capsule .
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Old 25th October 2002, 11:11 PM   #3
MGR is offline MGR
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I will scan today some of the Sanken devices that I have pried open.Yes they are in MT-200 package.As soon as I finish scanning I will post the pictures as soon as possible.

MGR
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Old 25th October 2002, 11:26 PM   #4
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Location: Perth, Australia.
http://www.wescomponents.com/ stock only original manufacturer transistors(their policy), and availability is always perfect, and prices pretty good.
When I buy high power audio transistors from WES, they are usually Sanken or Toshiba.
Alternatives, even though of the same type number are not always meeting the specs in my experience.
My local supplier usually buys from WES, but last thursday supplied me a 2SA1303 branded PMC sourced from a different wholesaler.
I was suspicious when I installed this transistor, and sure enough the transistor held up during initial runup and bias adjustment, but failed in the first 10 seconds of music input.
My supplier got toasted that day, and now knows not to do that again.
I have never had any trouble with WES supplied semiconductors.

Eric.
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Old 28th October 2002, 03:08 AM   #5
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Semiconductors marked PMC are all from China, I believe. They are grossly under rated and cannot stand upto to the ratings of the original devices. Never use these, if you can help it.
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Old 28th October 2002, 07:22 AM   #6
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If the manufacturer can't deliver a datasheet of their products, don't buy them. This is an asian phenomina I think. I have never heard of it here in Europe.
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Old 28th October 2002, 08:02 AM   #7
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Per-Anders,

I think the problem was not bad equivalents but genuine
counterfeits, that is transistors which are labelled as a
perticular type from a particular well-known manufacturer,
while they are in reality some other type, manufactured
somewhere else. This problem has been discussed in a
previous thread and there is also an article about it on
Rod Elliots home page, but I can't find neither right now.
Whether there is a risk of getting such countefeit devices
here in Europe, I don't know, I hope not.
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Old 28th October 2002, 08:24 AM   #8
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Default Are you kidding?

Here in Yugoslavia, you can only get counterfeit ones (OK, maybe some are original) Unfortunately I don't have digital camera to show you enternals of one MJ15003 I've opened - die covered with some white compound (maybe some silicon... heatsink compound or I don't know what). They look like some home made stuff

Don't think that it's problem only here. Only way to be shure is to buy directly from distributors listed on manufacturers sites, and to keep your eyes wide open
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Old 28th October 2002, 09:02 AM   #9
Electrons are yellow and more is better!
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http://sound.westhost.com/counterfeit.htm

Here it is.

Yes, I know there are real fakes, looks exactly as the real one, same marking and all. But I suspect also there are types which are also unclear marked. My advice to all DIY'er especially in the east, don't business with unkown sources. Maybe you should ask here at diyuaudio.com before you buy?

Edit:

Didn't know the problem was so near (me) but what type of firms do like this? Is it for private persons or the industry as well?
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Old 28th October 2002, 09:15 AM   #10
skaara is offline skaara  Slovenia
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Once I bought 2n3773 with Toshiba as manufacturer marked on them, they looked very bad ("made at home") like they were used. I opened some and there was the white silicon, and transistor inside was wery small, something like original 2n3055 which i opened for comparison. I also looked on toshibas page and there was no info about 2n3773.
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