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7th April 2011, 03:43 PM
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#1 |
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diyAudio Member
Join Date: Dec 2003
Location: Buenos Aires, Argentina
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original transistor data bank-useful data
the following info is extracted from TRANSISTORES ORIGINAIS - BANCO DE DADOS [Arquivo] - HT Forum
(brazilian, portuguese content) orientative capacitance base emitter base collector Motorola MJL21193 7 nF 2,1 nF MJL21194 6,8 nF 2,5 nF Toshiba 2sa1943 6,1 nF 3,1 nF 2sc5200 13.5 nF 13 nF Sanken 2sc2922 10.5 nF 6.2 nF 2sa1216 9 nF 3.5 nF |
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7th April 2011, 04:13 PM
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#2 |
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diyAudio Member
Join Date: Dec 2003
Location: Buenos Aires, Argentina
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...intel inside...
I bought this ******* yesterday... suspecting a dead rat inside, I did a search that led me to the brazilian forum...
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7th April 2011, 04:26 PM
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#3 |
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diyAudio Member
Join Date: Dec 2003
Location: Buenos Aires, Argentina
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some more data
a pair of originals that I have measure close to the data of the brazilian forum
the fakes not even close... orientative capacitance, base collector/base emitter 2sa1943 6,1 nF 3,1 nF 2sc5200 13.5 nF 13 nF |
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7th April 2011, 11:57 PM
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#5 |
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diyAudio Member
Join Date: Dec 2003
Location: Buenos Aires, Argentina
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The values posted are informative. Easy accesible by using a tester with capacitance measurement fixture.
This are not the last word in accuracy, -the component is measured in a rough manner, out of the circuit-. But useful enough for ¨in the field¨ usage, ie, when shopping parts, or when dealing with suspecting ones... Thanks to this data, I have avoided harm to drivers and circuitry of a nice vintage amp, plus some profane wording... Now, time to get a refund... 
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8th April 2011, 03:59 PM
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#7 |
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diyAudio Member
Join Date: Feb 2005
Location: Zagreb
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One of the clues is that the beta ranking mark is not right. Subtle changes in marking are often used to avoid lawsuits ('see, this marking is not the same, therefore we did not attempt to make a fake, just an equivalent').
The one shown by WuYit is what some manufacturers will sell as 'second source', however the specs are only similar, not the same (in particular, current and voltage tend to be the same but capacitances, gain and SOA are not, usually it's recycling older parts such as MJ15003/4). |
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8th April 2011, 05:34 PM
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#10 |
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diyAudio Member
Join Date: Mar 2003
Location: Sibenik, Croatia
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He confused me. Well, I bought bunch of these SanKen's 2SA1295/2SC3264 from Lily Electronics Salon and haven't found any problems. I even smashed one and he looks exactly as that transistor shown on WuYit's picture. But goddamn paranoia, I thought WuYit knows something we don't. He probably had a bad experience with Electronics Salon? Like I said, goddamn paranoia.
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