replacement 2sa1142p

rick_noname · 30th November 2009, 06:10 PM

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...

wahab · 30th November 2009, 06:39 PM

yes, it should work , provided it s well cooled, as the TDP is
7W rather than 10W in the original part..

rick_noname · 30th November 2009, 07:05 PM

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.

wahab · 1st December 2009, 12:41 AM

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...

rick_noname · 09:12 PM

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.

Regards Rick...

wahab · 1st December 2009, 10:04 PM

[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.

Regards Rick...[/QUOT

perfect....i couldn t have make it better..
hope you now enjoy your denon PMA...very good amp,, anyway...

rick_noname · 1st December 2009, 10:23 PM

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...

30th November 2009, 06:10 PM	#1
rick_noname diyAudio Member Join Date: Nov 2009	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...

1st December 2009, 09:09 PM	#5
rick_noname diyAudio Member Join Date: Nov 2009	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. Regards Rick... Last edited by rick_noname; 1st December 2009 at 09:12 PM.

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30th November 2009, 06:39 PM	#2
wahab diyAudio Member Join Date: Nov 2009 Location: algeria/france	yes, it should work , provided it s well cooled, as the TDP is 7W rather than 10W in the original part..

30th November 2009, 07:05 PM	#3
rick_noname diyAudio Member Join Date: Nov 2009	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.

1st December 2009, 12:41 AM	#4
wahab diyAudio Member 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...

1st December 2009, 10:04 PM	#6
wahab 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. Regards Rick...[/QUOT perfect....i couldn t have make it better.. hope you now enjoy your denon PMA...very good amp,, anyway...

1st December 2009, 10:23 PM	#7
rick_noname diyAudio Member 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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