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2SJ50 and 2SK135 mosfet transistors
2SJ50 and 2SK135 mosfet transistors
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Old 11th September 2008, 12:13 PM   #11
unclejed613 is offline unclejed613  United States
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i saw the 1900pf input capacitance, and wondered if they were dual die types.that is a large enough capacitance to need more drive current. IIRC, the hitachi devices were about 900pf i think i still have the original hitachi power mosfet data book from 1980 around here somewhere.

looked it up on datasheetarchive.com
ys the 2SK135 Ciss is 900pf
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Old 11th September 2008, 02:53 PM   #12
lineup is offline lineup  Sweden
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Default Re: 2SJ50 and 2SK135 mosfet transistors

Originally posted by xecluded

My amp needs 2 for each of these 2SJ50 and 2SK135 mosfet transistors.
Does anyone know where I can get them in US.... Thanks.
Originally posted by ostripper
Very hard to find part.. Try littlediode.com..they have them but
they are 25-35$ apiece..owww

I have read you can sub 2sj162/2sk1058 at 10$ apiece with
minor mod because of different package TO-3/TO-247.
As ostripper said.
Those are very old mosfet (was very good for their time!).
You should try to find a some later MOSFET substitute.
- 2SK1058 and 2SJ162, from HITACHI
- 2SK1057 2SJ161 and - 2SK1056 2SJ160 are good try!

They are not too different in type. And most probably a slight modern IMPROVEMENT.

If you still want to go 'the original old' way.
You can look for these, too, from HITACHI:
2SJ48 - 2SK133 ...... 2SJ49 - 2SK134

See my attachment:
Attached Images
File Type: png sj49_sk135_hitachi_mos.png (70.0 KB, 429 views)
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Old 11th September 2008, 04:25 PM   #13
xecluded is offline xecluded  United States
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Thanks all for your help locating/substitute my chips. We recently had a new baby so I am quite busy and can not respond right away. I will investigate my options. Thanks again everyone for your help.
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Old 15th April 2009, 08:06 PM   #14
Alans is offline Alans  Belgium
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Hello everyone,

If want the absolute 2SK135 and 2SJ50 vintage (Hitachi).
Why the same references would not be valid at Radiospares for Crescendo in Elektor December 1982:

Is there any doubt?
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Old 15th April 2009, 08:23 PM   #15
peranders is offline peranders  Sweden
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2SJ50 and 2SK135 mosfet transistors
I had 100 of each but not anymore... You can get original Hitachis. Searched Ebay?
/Per-Anders (my first name) or P-A as my friends call me.
SSR03 group buy. Sign up for interest HERE. 21 pcb's in order. 0 paid.
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Old 15th April 2009, 08:51 PM   #16
russel is offline russel  Europe
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Default FET replacements

These are on Ebay

http://cgi.ebay.com/10N16-10P16-Audi...arms=72%3A1240|66%3A2|65%3A12|39%3A1|240%3A1318|301%3A1|293%3A1| 294%3A50

or http://tinyurl.com/c4w4bm

These look like the Profusion devices which I think are made by Semefab/Magnatec. I do not bother with NOS for semiconductors as I am happy that modern lines can fab them as well or better than the old ones. Valves that's a different story.
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Old 16th April 2009, 02:42 PM   #17
Alans is offline Alans  Belgium
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Yes absolutely, it is MagnaTec: 2SK135 and 2SJ50, characteristics are the same!
According to the update of Ray's Crescendo http://members.quicknet.nl/ra.vdsteen/crescendo_en.html there are also replacements: BUZ900 and BUZ905 the same manufacturer, but if the original transistors are made we will have more chance today to find components with modern manufacturing techniques.

Question : 6h5c, that you think of this statement?
If an administrator can send to 6h5c, it would be very nice!

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