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Old 23rd September 2008, 04:11 PM   #191
pjp is offline pjp  India
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I popped the case on the AD149.
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Old 29th September 2008, 10:25 AM   #192
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I haven't popped the case on any of my AD149s, mainly because they're still working and I might find a use for them as a low-dropping series regulator or some other non-audio application.

However, I'd say that the die size on your AD149 is generally about right, even if it looks very small. What is suspicious, however, is the way it has been attached to the backplate - there are untidy traces of bonding material all around. That would suggest a manual cottage-industry operation, not an automated manufacturing line - increasing the probability that it is indeed fake.
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Old 29th September 2008, 06:38 PM   #193
pjp is offline pjp  India
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linuxguru, the magnification on that image is quite high.
The actual die is about 1mm x 1mm.
The AD149 is a 40W part - is 1x1mm large enough for that ?

And googling suggests the AD149 was an Alloy Junction transistor, which this die certainly isn't.
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Old 22nd October 2008, 07:43 AM   #194
clm811 is offline clm811  United States
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Default Anyone have experience with this seller?

I saw some transistors on eBay for a fair price, from "ALLPARTSPIPE".

They claim they are genuine Motorola.

Anyone have experience with this seller?

-chas
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Old 1st November 2008, 03:58 PM   #195
alextix is offline alextix  Ukraine
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Hi. What you will say about these 23055, genuine?
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Old 20th November 2008, 01:44 PM   #196
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Default 2SK389 - forgery

2SK389 - TO-92, three legs, from Matchaknob, NY.
I've got the last stock. Apparently, they have sent plenty of
them to unsespecting buyers. At least for the 2SJ109 they did
mention three legs in their catalog, but not for the 2SK389. What a surprise!
I have filed a complain with my credit card and sent the datasheet to the distributor (no response).
Better Business Bureau and Attorney General of NY can also be
informed, if necessary.
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Old 4th December 2008, 08:17 AM   #197
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Go for it.

5 or 6 years ago, they advertised some NOS Toshiba TO-3's (can't remember the number). I bought a few as a test, and they were authentic. So I queued up the credit card and bought a couple hundred dollars worth and set them aside. When I finally got around to using them about 8 months later, I discovered about 3/4 of them were Chinese fakes. Much too late for my poor credit card...
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Old 4th December 2008, 10:49 PM   #198
anatech is offline anatech  Canada
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Hi,
I can't stress this enough. You must buy your parts through normal and established vendors who are dealers for the part in question. Lately, a number of second source suppliers have appeared. Treat them as an unknown manufacturer and test some before committing to a large buy. Once you become familiar with that manufacturer (and they are acceptable!), just make sure you buy from their dealer network. Don't assume a second source part is identical until you prove it.

There are factories in China that are producing hard to get transistors. They may be legitimately trying to produce an equivalent part, but you really need to make sure in these cases. Watch for quality control variations.

I have bought parts from various small vendors, some on Eeekbay. Some of these are garbage and others have turned out to be the real deal. You just never know.

Some real uPA68H dual fets would be nice to find. However, if there are 100 pcs available I'd be real suspicious! You have to consider what is reasonable for a long discontinued part. The back story is going to be extremely important in these circumstances.

-Chris
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Old 5th December 2008, 12:33 AM   #199
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Quote:
Originally posted by anatech
Hi,
I can't stress this enough. You must buy your parts through normal and established vendors who are dealers for the part in question.
I'm with you 1000%, my friend. Learned my lesson back then, and I've been parroting the same message since.
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Old 5th December 2008, 01:37 AM   #200
anatech is offline anatech  Canada
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Hi Glenn,
Yep, I just wanted to say something and I couldn't think of anything intelligent, so I posted here.

I'm sorry to hear you got, got. These vendors ought to know better. That's where the old jobber system worked well. You could see exactly what you were getting. That is unless the bag said "ECG". Fakes and remarks have been with us for a very, very long time. Even in the tube days. "Original Equipment" anyone?

-Chris

Edit: You have a nifty avatar. I like mine with a clip, but we are restricted to 10 or less. Well, it's not like you want to squeeze off more than one without ear defenders and glasses.
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