2SK170 Datasheet says "Not Recomm for New Designs"?? ... - diyAudio
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Old 1st April 2013, 04:14 AM   #1
andyr is offline andyr  Australia
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Default 2SK170 Datasheet says "Not Recomm for New Designs"?? ...

Has it been replaced by a new JFET?


Thanks,

Andy
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Old 1st April 2013, 05:17 AM   #2
Fenris is offline Fenris  United States
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Nope. Discrete audio transistors are a niche market. The vast majority of the consumer market has gone integrated (op-amps, monolythic ICs, and class-D). There's not enough profit to continue producing these specialized JFETs. There are some substitutions that are close, a bit of searching through the forums can find a few threads with the info.
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Old 1st April 2013, 09:05 AM   #3
knutn is offline knutn  Norway
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Toshiba does not produce JFETs any more. There are still a lot of 2SK170 floating around, and Linear Systems produce a direct replacement, called LSK170.
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Old 1st April 2013, 09:18 AM   #4
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BF862 is in essentially all respect better than the 2SK170, widely available and relatively cheap.

Samuel
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Old 1st April 2013, 09:37 AM   #5
andyr is offline andyr  Australia
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Thank you very much, knutn & Samuel.

So if I want a 2SK170GR-equivalent, should I choose the LSK170 ... or the BF862?

And Samuel ... in what way is the BF862 better than a 2SK170?

Regards,

Andy
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Old 2nd April 2013, 06:04 PM   #6
gk7 is offline gk7
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Toshiba does actually produce new FETs for audio, but n-channel and smd only.
Example:
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