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Sumo polaris Mosfets needed

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xedox

Member
Joined 2013
#1
Hello members of diyaudio,


i know i am looking for the needle in the haystack but i give it a try.


i own one Sumo Polaris power amplifier that needs new output transistors


original mosfets are


2sj115 / 2sk405 they are obsolete


they can be replaced with:


2sj200 / 2sk1529


or


2sj201 / 2sk1530


there are 4 mosfets per channel 2 x 2



therefore i need 4sj and 4sk matched 2 x 2


if anyone can provide them please dont hesitate to contact me.


thanks in advance
 
#5
Good advice about not exchanging Hitachi and Toshiba however. In addition to different biasing needs, the pinouts are different!

The 2SJ115 and 2SK405 just earlier versions of the 2SJ200-1/2SK1529-30

mlloyd1

aparatusonitus said:
Do not try to change Hitachi's for Toshiba's...Hitachi's are lateral mosfets, Toshiba's are vertical mosfets - totally different devices and you will be not able to bias them properly.
But there is the light...you can buy proper lateral mosfets from Profusion ECX10N20/ECX10P20 see Lateral MOSFETs | Profusion
Click to expand...
 
#7
mlloyd1 said:
Good advice about not exchanging Hitachi and Toshiba however. In addition to different biasing needs, the pinouts are different!

The 2SJ115 and 2SK405 just earlier versions of the 2SJ200-1/2SK1529-30

mlloyd1
Click to expand...

Hmmm...we are both wrong...😱Hitachi's are vertical mosfet (I did not pay enough attention to the Id vs Vgs graph for 2SJ115, from a distance they seems to have zero temco at about 100mA similar to the other laterals, but here it is 1000mA (1A) not 100mA as I thought in the first instance. Similar Id vs Vgs graph from 2SK405 datasheet (zero tempco about 4A) confirms that it is a vertical mosfet.

Hitachi's and Toshiba's have the same pinout G D S, they are the same type of mosfet (verticals) so they can replace each other with careful biasing.
 
#8
many thanks for all the replys.


@jackinny


thank you for the generous offer
i know you strugeld with this amp a few years ago. How did it end?


i dont even know if its worth all the trouble?


can i contact you over PM?
 
#10
Toshiba ONLY made verticals.

Hitachi made both laterals AND verticals.

Hitachi verticals were not (often) used in audio amps (at least that I've been able to identify).

Hitachi laterals have a different pinout from Hitachi verticals/Toshiba verticals. See attached picture of pinouts from old Borbely amp project.

I assume (i know, i know, my mistake 🙂 ) that when someone mentions Hitachi MOSFETs in regards to audio, they are referring to lateral technology.

Laterals and verticals are not (easily) interchangeable.
That's the warning I want to express.
sorry ...

mlloyd1

aparatusonitus said:
Hmmm...we are both wrong...😱Hitachi's are vertical mosfet (I did not pay enough attention to the Id vs Vgs graph for 2SJ115, from a distance they seems to have zero temco at about 100mA similar to the other laterals, but here it is 1000mA (1A) not 100mA as I thought in the first instance. Similar Id vs Vgs graph from 2SK405 datasheet (zero tempco about 4A) confirms that it is a vertical mosfet.

Hitachi's and Toshiba's have the same pinout G D S, they are the same type of mosfet (verticals) so they can replace each other with careful biasing.
Click to expand...
 

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#11
hi,


just a quick update to my thread


many thanks to all posters, still so much to learn.


@jackinnj


thanks for offering the needed parts, i found them here in Europe now.



@Bensen


thanks for helping out


diyaudio members just rule



kind regards
 
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