Can I use the 2N5484 jfet diff pair in an audio amplifier front end? - diyAudio
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Old 25th March 2009, 12:09 AM   #1
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Default Can I use the 2N5484 jfet diff pair in an audio amplifier front end?

Hi guy,

I've been searching for alternative jfets, in case the 2SK170 becomes scarce--and for the shear fun of trying something new--and because I'm a tightwad on a budget. Ok, the last item should have probably been first in line.

I tried simming with a replacement from the SIMetrix library: 2N5484 was the first in line, so I gave it a go. I had to reduce the current, but it seems to sim nicely.

Anyone ever try this approach?
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Old 25th March 2009, 05:43 AM   #2
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Factor of 10 less gain, and noisy below 1kHz. Even above 1kHz is factor of 2-3.


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Old 25th March 2009, 09:31 AM   #3
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Thank you very much, Patrick.

Is there a suitable replacement for the 2SK170? I'm willing to double up components.
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Old 25th March 2009, 01:11 PM   #4
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I find SK170 so cheap I buy 100 at a time, match them closely for LTP use, and the rest I use as current sources/sinks.

SK170 (and SJ74) is in no way perfect, so I think it's interesting to hear of alternatives, so please report your findings.
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Old 25th March 2009, 02:04 PM   #5
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You may check this thread:
Group Buy: Linear Systems LSK389 / LSK170 JFETs (i.e. Toshiba 2sk389/2sk170 subs)
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Old 25th March 2009, 03:44 PM   #6
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Quote:
Originally posted by carpenter

Is there a suitable replacement for the 2SK170? I'm willing to double up components.
2SK369


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Old 25th March 2009, 03:46 PM   #7
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I've been scouring over my folder of "Choky" stuff. I reexamined the pumpkin (got to build that someday) and noticed he's using the J309.

That, of course, gave me the proper search word for DIY Audio. Within seconds, I had a long list of posts to read. It seems the J309 and it's J310 sibling are making more than one owner happy.

Off to Mouser I went. They have the J310 going for the ridiculous price of $37.00 for 500 pcs. I'm going to give it a go. I can match transistors and build amps until the moon falls from the sky at that rate.

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Old 25th March 2009, 03:47 PM   #8
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Magura's a funny guy....
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Old 25th March 2009, 04:45 PM   #9
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Quote:
Originally posted by carpenter
Magura's a funny guy....

But really, how many would you like ?


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Old 25th March 2009, 05:15 PM   #10
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> Is there a suitable replacement for the 2SK170? I'm willing to double up components.

http://www.diyaudio.com/forums/showt...43#post1774443


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