2SK135/2SJ50 history - diyAudio
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Old 25th May 2006, 02:13 AM   #1
Leolabs is offline Leolabs  Malaysia
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Question 2SK135/2SJ50 history

Just a few questions.When were they manufactured??When were they discontinued??And why??

Any fan of them here??
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Old 25th May 2006, 05:17 AM   #2
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They came in the beginning of the 80's. Made by Hitachi which has changed their name to Renesas. You can still get them, you have second source but the plastic model is available from Renesas.

Parts are always discontiued for three reasons:

1 Won't sell

2 Change of technology

3 Other reasons

I'm a fan. I like them.
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Old 25th May 2006, 09:16 AM   #3
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where to get them?
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Old 25th May 2006, 09:18 AM   #4
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P-A,

i thought at the end of the 70s, they became available outside Japan in the early 80s.
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Old 25th May 2006, 12:36 PM   #5
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Old 26th May 2006, 08:53 AM   #6
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20 pounds for a mosfet, very ethical company.
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Old 26th May 2006, 09:20 AM   #7
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Quote:
Originally posted by Luke
20 pounds for a mosfet, very ethical company.

Hi

These guys supply equivalents

http://www.profusionplc.com/subsites/exicon.htm

best
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Old 26th May 2006, 09:22 AM   #8
AndrewT is online now AndrewT  Scotland
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Hi,
the plastic package replacements for these are available from a few manufacturers.

Are the To3 version only available from Exicon?
Are the Hitachi versions obsolete?
Do Renaisis supply To3 versions? or anyone else?
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Old 26th May 2006, 10:14 AM   #9
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I've got a pair of old amp boards with these devices, not being a great fan of mosfets I didn't realise they were so sought after. I might have to recap them and give them a go, or if anyone has a good circuit I might be interested in reusing them in something else.
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Old 26th May 2006, 11:26 AM   #10
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i read my first article about these in 1977(?). i think it was in IEE Consumer Electronics Transactions (?). the circuit they presented was the differential first stage, differential vas stage, driving the mosfets directly.
i wrote to hitachi and first got some samples in my hands in late 1979.

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