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?

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


Patrick

Thank you very much, Patrick.

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

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.

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

2SK369 :D


Magura :)

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

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

But really, how many would you like ?


Magura :)

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

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


Patrick