Author Topic: EL300 DC load and obsolete Motorola Transistor SJ1891  (Read 1535 times)

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Offline Jester

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EL300 DC load and obsolete Motorola Transistor SJ1891
« on: October 31, 2017, 12:04:37 am »
I picked up a working 60A, 60V DC load ---- AC/DC Electronics EL300 for $25

I found a manual online that includes the schematics. Looks like it uses SJ1891 output transistors, I have searched high and low for a data sheet, does anyone have a clue what an appropriate substitute would be?

Looks like this:
 

Offline Vgkid

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Re: EL300 DC load and obsolete Motorola Transistor SJ1891
« Reply #1 on: October 31, 2017, 01:26:13 am »
I will need to look on my old computer i believe it was a to -204 , 2n62xx. It was 20 - 30a NPN
Quick mouser look suggests 2n5886 , or 2n6341.
If you own any North Hills Electronics gear, message me. L&N Fan
 
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Offline Jay_Diddy_B

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Re: EL300 DC load and obsolete Motorola Transistor SJ1891
« Reply #2 on: November 01, 2017, 04:38:40 am »

Looks like it uses SJ1891 output transistors, I have searched high and low for a data sheet, does anyone have a clue what an appropriate substitute would be?


SJ were house numbered transistors so very little information is available.

In this application I would use a 2N3773 or MJ15024. Both of these are high power audio transistors.

Pay attention to Safe Operating Area curves, particularly the second breakdown limits.

It goes without saying, that you have to watch out for fakes.

Regards,

Jay_Diddy_B
 
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Offline Indirtwetrust

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Re: EL300 DC load and obsolete Motorola Transistor SJ1891
« Reply #3 on: June 28, 2018, 08:44:47 pm »
Did you have any luck finding a suitable replacement?  I just st got a hold of EL750B and I need the same part
 

Offline David Hess

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Re: EL300 DC load and obsolete Motorola Transistor SJ1891
« Reply #4 on: June 30, 2018, 03:54:41 pm »
It would help to see a schematic, a photograph of the transistors where they are mounted, and a photograph of the transistor tops.
 


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