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Old 27th September 2006, 05:55 AM   #111
MGR is offline MGR
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I have tested this transistors using +- 90 supplies into a 4 ohm load with no failures.Actual test into my friends mobile rental amps for 1 year with o failures.In my research I bought from at least 5 different stores in RAON most of them failed.And yes capacitance is a good way to separate the genuine from the fakes.I also bought from digikey and compared it to the one I bought in Ronquillo they are the same in quality.
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Old 27th September 2006, 06:03 AM   #112
clem_o is offline clem_o  Philippines
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Hi MGR,

That's great!!! Thanks for the tip too - now perhaps that gives some more impetus to go ahead and build a good amp!

Cheers
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Old 27th September 2006, 06:13 AM   #113
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hi clem_o,

will you be using DMM for this tests.

well we are all drowned with fakes these days..

so thats why for my projects I have to spend so much for

Onsemi's MJL's

macweb
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Old 27th September 2006, 07:00 AM   #114
rlg_200 is offline rlg_200  Philippines
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Default fake op

hello guy,

fyi, 2sc5200, 2ca1943 absolutely fake if the part number can easy to read. i bought in eleshop raon. when I powered it to my amp my fuse blown. just for curious I cracked it and I found that the die is undersized.

there is one transistor the part number is hard to read, but no idea if it is genuine. according to the store (eglo electronics supply) it is original daw. I dont think so the price is cheap php 90. huh

rlg
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Old 27th September 2006, 07:08 AM   #115
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hi rlg_200,

are there Onsemi power outputs available in your place
MJL4302/MJL4281 or other related trannies....?

macweb
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Old 27th September 2006, 07:36 AM   #116
rlg_200 is offline rlg_200  Philippines
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hienrich,

mjl4302/mjl4281, as know this device is high voltage 350 volts vce I think, it uses by ESP high end, here in Raon alexan not yet available out of stock daw, But u can go to mjl21193/94 it is almost the same characteristics 250 volt vce, (onsemi). php 430/pc. in alexan. power op BJT will sell in alexan are onsime and fairchild.

rlg
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Old 27th September 2006, 07:45 AM   #117
rlg_200 is offline rlg_200  Philippines
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hi MGR,

what's the name store u bought that part in raon 2sc5200/2sa1943, how much per pc.

rlg
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Old 27th September 2006, 10:43 AM   #118
clem_o is offline clem_o  Philippines
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Quote:
Originally posted by hienrich
hi clem_o,

will you be using DMM for this tests.

well we are all drowned with fakes these days..

so thats why for my projects I have to spend so much for

Onsemi's MJL's

macweb

Hi hienrich,

No, I'll bring a capacitance tester. Some DMMs have this function, but I haven't tried if these are 'capable'. The requirement essentially is that the meter must be able to see into the nF range, and that the test voltage used by the meter is low enough so as not to bias the B-E junction (so the test signal should be ~100mV).

Cheers!

Clem
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Old 27th September 2006, 02:46 PM   #119
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hi clem_o,

I hope I aquire such tester soon, I hope I could find one in Cebu.
pls. post what ever will be your developments.


hi rlg_200

what 430 a pc.
Id rather go for 5200s and 1943s

well I still hope to find them here as originals...

I am so lucky to have some MJLs given to me as bday gift
from a cousin. but still not enough for some future projects.

maayong gabi i natong tanan,

macweb
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Old 27th September 2006, 05:41 PM   #120
xaudiox is offline xaudiox  Philippines
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hienrich

how many MJL4302/MJL4281 do you need? i maybe able to help you get this trannies.
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