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Old 31st December 2006, 10:51 AM   #1
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Default help with replacing my transistor on my Electrocompaniet

Good evening to everybody!

i need your help!
The transistors (driver and output stage) on my elecctrocompaniet ECI-4, just burned last week.

Up till now the only way to find out what happened is to check the board for short circuit (thing that i did) and.... for the fact that a feedback network is applied and so then is no any longer possible to evaluate the circuit unless all the parts are replaced...and then from that....trying to undersupply the stage and search the problem.

(If anybody wants to give suggestions i accept them!)

The components that i need are:

- complemantary motorola MJL 3221 and MJL 1302

- ( i think those are toshiba, but i'm not sure...i cannot say from the pakage...there no name...augh)
A 1350 Y and C3421 Y

- BD 679 (on the package i foung the mark ST MRC.... is it the trademark of STMicroelectronics?)


i would need a selected complementary transistor since those bjt are feeding a push-pull output stage and a phase splitter stage rispectively.

I would like to know, if anybody knows where i can find those selected couple on internet (and also the bd679 of course ) for a good price.

If the selected couple are really that expencive, is it convenient for me to select on my own or it's definitely better to buy just the couple selected by the companies?

thanks in advance.


Best Regards,
Stefano.
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Old 31st December 2006, 10:55 AM   #2
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sorry to post this 3d on this section.
I 've tried to put it on the solid state's section but i didn't receive any real answer
I don't know....here may be somebody else sees it and may help me out...hope!

Hope this post won't bug you guys!

Best,
Stefano
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Old 1st January 2007, 12:58 AM   #3
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Hi Stefano!

Cant help you out, but meybe some of the guys on this norwegian massage board can help you:

http://www.hifisentralen.no/cgi/yabb...tart+nytt+emne

Under "Emne", you put the title.

Good Luck, and a happy new year.
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Old 2nd January 2007, 09:57 AM   #4
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well......i apprechiate your post....ehehe.....but.....unfortunally i cannot understand anything!!!

it's in their language!!!!

never mind....thanks anyways!
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Old 2nd January 2007, 11:54 AM   #5
MikeW is offline MikeW  United States
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What package are they? Plastic of TO-3 caps? How many do you need?
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Old 2nd January 2007, 12:44 PM   #6
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the following table would rapresent my order:
(all the pakages are plastic)



Manufufacter Part numb. Qty.
-------------------------------------------------------------
Mototola MJL3281A 5
Motorola MJL1302A 5
Toshiba 2SA1350Y 10
Toshiba 2SC3421Y 10
ST Microelectronics BD679 5


I forwarded my email to different companies but i haven't gotten any answer up till now.
It might be possible that the quantity is not enough to make them considering my order.
But otherwise i don't have any clue where to buy those items.


Do you have any link contact or any where i can possibily attend to?

Moreover: how coul i buy selected part? or could i select (since the low cost of this parts) the transistor on my own? if yes, how?


Thanks a lot!
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Old 3rd January 2007, 07:19 PM   #7
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Stefano, you dont want 2SA1350. The correct number is 2SA1358. This is the partner for 2SC3421.
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Old 4th January 2007, 06:41 AM   #8
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interesting....i'm preatty sure it's the 50....but i'll check and see.
I could be wrong.
Anyways thanks for the highlight!!

Best,
Stefano.
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Old 4th January 2007, 07:15 AM   #9
cviller is offline cviller  Denmark
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Have you found any of the transistors you need?

At the place I usually order they seem to have:

2SA1358 PNP TRANSISTOR 120V/1A/10W
2SC3421Y NPN TRANSISTOR 120V/1A/10W
BD679 NPN TRANSISTOR 80V/4A/40W DARL

I couldn't find the motorola devices. I don't know if this is similar (I havn't checked schematics)
2SC3281 NPN TRANSISTOR 200/200V/15A/150W

But I couldn't find the complementary pnp.
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Old 4th January 2007, 07:36 AM   #10
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well....it's difficolt to find all the parts.
The dial is that i would like to buy the exact part from the same manufacter.
For example the 2sa/c by toshiba, the bd by STM and MJL by Motorola.

What's the dialer that qre you referring to?
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