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Old 30th November 2009, 07:10 PM   #1
diyAudio Member
 
Join Date: Nov 2009
Default replacement 2sa1142p

As replacment of 2sa1142P in my Denon PMA1560 AMP they have give me
2sa1546 from NEC

2SA1546 pdf, 2SA1546 description, 2SA1546 datasheets, 2SA1546 view ::: ALLDATASHEET :::

Vceo is a bit higher, a1142 =180V a1546 = 250V

Can i use this 2sa1546 as a good replacement without any danger problems.

Regards Rick...
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Old 30th November 2009, 07:39 PM   #2
wahab is offline wahab  Algeria
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Location: algeria/france
yes, it should work , provided it s well cooled, as the TDP is
7W rather than 10W in the original part..
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Old 30th November 2009, 08:05 PM   #3
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Hi wahab, thnks for your information.

It`s not possible to use it without any heatsink i understand, or is it possible.
Do you think that will be a big problem? Because there is not such much place for a heatsink.
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Old 1st December 2009, 01:41 AM   #4
wahab is offline wahab  Algeria
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Join Date: Nov 2009
Location: algeria/france
as i understand, it s not fixed on a heatspreader...
even so, the original did surely fail because it wasnt cooled..
since there s a hole on this trans. , you can surely fix a little
piece of metal, a few cm2, so it will be at a significantly
lower temperature...an aluminium plate of 2 X 3 cm should be enough...
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Old 1st December 2009, 10:09 PM   #5
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hello WaHab,

Do you think this is ok now at this moment.
There was not many space, but ok, I hope this will work.

Only had to move 3 resistors to the backside, but i don`t think that is a problem.

Click the image to open in full size.

Regards Rick...

Last edited by rick_noname; 1st December 2009 at 10:12 PM.
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Old 1st December 2009, 11:04 PM   #6
wahab is offline wahab  Algeria
diyAudio Member
 
Join Date: Nov 2009
Location: algeria/france
[QUOTE=rick_noname;1998643]hello WaHab,

Do you think this is ok now at this moment.
There was not many space, but ok, I hope this will work.

Only had to move 3 resistors to the backside, but i don`t think that is a problem.

Click the image to open in full size.

Regards Rick...[/QUOT

perfect....i couldn t have make it better..
hope you now enjoy your denon PMA...very good amp,, anyway...
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Old 1st December 2009, 11:23 PM   #7
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Join Date: Nov 2009
Ok thnks, i`am happy with it.

It`s a lot of work. I have replaced all TR positions on the left and right amp.
Also all diodes and burned resitors.
In the whole amp i replaced all electrolytes and renewed all solder points.
It was a hard way to find a lot of originals components. Bigred from Diyaudio had send me 3 matched pairs of 2sk184gr. so everything is completed now.
also original new op-amps.

So for now de last litle things and then i hooooooooooooope it will works like a new one

Maybe, you have also some tips for this amplifier.


Thnks for your help.

regards Rick...
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