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Old 11th October 2005, 08:29 PM   #1
sdoom is offline sdoom  Germany
diyAudio Member
Join Date: Mar 2004
Location: Heidelberg
Question Alpine 3544 transistor question

Hi @ all

I got an old Alpine 3544 amplifier that has a broken small signal transistor. The transistor is not elec. damaged, the owner dropped the amp and the speaker terminals pushed away a 1000µF cap and this small transistor where 2 legs are now missing.

Could this be an UN6211 ?

Click the image to open in full size.

the transistor is mounted near the PWM-controller and it looks like that this thing is acting with the RMT-Signal.
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Old 12th October 2005, 04:46 AM   #2
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Join Date: Aug 2005
would say your right.
if its from around the output area, cant you check with the other channel ?
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Old 14th October 2005, 04:52 PM   #3
sdoom is offline sdoom  Germany
diyAudio Member
Join Date: Mar 2004
Location: Heidelberg

hmm, this thing is mounted near the TL494 , so it´s not used in the music section. As far as I can follow those thin curcuit lines this thing is connected to the RMT-terminal via resistors and diodes.

I assume I wil have to contact Alpine to find out. I mean I don´t need a complete service manual, just need to know what kind of part that is.

Does anyone have experience with Alpine-support?


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Old 15th October 2005, 01:22 AM   #4
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Join Date: Aug 2005
dont see why you'd need the service manual etc.
would just replace it.
does indeed sound like it's the remote sense transistor, so if you cant get the same one, should be able to use a whole swag of common parts.

real quick google search turned up this

so looks like its readilly available from all over the place, and also easily replaced with something else.
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Old 18th July 2009, 09:45 PM   #5
sdoom is offline sdoom  Germany
diyAudio Member
Join Date: Mar 2004
Location: Heidelberg
For anyone who runs into the same problem:

the direct replacement parts for the UNxxxx series are the DTA or DTC series transistors (depending on polarity and integrated resistor values) .

I replaced the UN6211 with a simple BC547 and two 10kOhm resistors and the amp starts and runs fine.
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