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-   -   Can I use the 2N5484 jfet diff pair in an audio amplifier front end? (http://www.diyaudio.com/forums/pass-labs/141114-can-i-use-2n5484-jfet-diff-pair-audio-amplifier-front-end.html)

carpenter 25th March 2009 12:09 AM

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?

EUVL 25th March 2009 05:43 AM

Factor of 10 less gain, and noisy below 1kHz. Even above 1kHz is factor of 2-3.


Patrick

carpenter 25th March 2009 09:31 AM

Thank you very much, Patrick.

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

nelsonvandal 25th March 2009 01:11 PM

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.

coloradosound 25th March 2009 02:04 PM

You may check this thread:
http://www.diyaudio.com/forums/showt...039&highlight=

Magura 25th March 2009 03:44 PM

Quote:

Originally posted by carpenter

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

2SK369 :D


Magura :)

carpenter 25th March 2009 03:46 PM

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.

;) :D

carpenter 25th March 2009 03:47 PM

Magura's a funny guy....:D

Magura 25th March 2009 04:45 PM

Quote:

Originally posted by carpenter
Magura's a funny guy....:D

But really, how many would you like ?


Magura :)

EUVL 25th March 2009 05:15 PM

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

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


Patrick


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