low noise jfet for audio

[asdf]

What jfet would you suggest for use in a dynamic mic or guitar preamp?
Nothing audiophile is needed: the input signal will be strong (rock band
in a small room), so I'm after a (through hole) low cost part that
doesn't add too much garbage to the signal. Having to get it online I
will likely purchase a bagful of them for use in other audio projects of
mine (mostly guitar fx) so cost may be an issue.

After digging the net it seems that a good part would be the 2SK170 by
Toshiba which is fairly priced IMO. But what's the difference between the
BL and GR variants?
Other candidates might be the 2SK117 and 2SK246, any opinions on those?
I also stumbled upon some preamps using the J201, like the famous Tillman
cable preamp, but that part got some negative opinions around for being
noisy and not that good for buffering due to its relatively high output
impedance. Any suggestions?
Thanks!

ps. some time ago I gave a try at a well known preamp built around the
not-for-audio 2n7000/BS170 mosfet. It sounded really good and quiet
enough at home, but what if I move that preamp to a real studio where
their higher quality gear would not mask its noise anymore?

 

[Ecnerwal]

In article <k7r8pu$e45$1@speranza.aioe.org>, asdf <asdf@nospam.com>
wrote:

What jfet would you suggest for use in a dynamic mic or guitar preamp?
....
Any suggestions?
....
ps. some time ago I gave a try at a well known preamp built around the
not-for-audio 2n7000/BS170 mosfet. It sounded really good and quiet
enough at home, but what if I move that preamp to a real studio where
their higher quality gear would not mask its noise anymore?

BF862 was strongly suggested for something current when I asked a
similar question a few months back. I bought some.

I also picked up some 2SK880's to play with.

If the preamp is quiet, it's quiet - not all studio gear is actually so
much better than clean home gear - more expensive, yes, but
better/quieter? - actually varies quite a bit. Try it and see. Or simply
listen to it directly with a good set of headphones - then there's no
other "gear" in the train.

Whether or not a FET happens to be touted for audio makes no difference,
so long as it performs. Might make it less expensive, though - the BF862
is a mass-market part pushed for the RF part of car radios, that happens
to be nice and clean as well as somewhat cheaper than the 2SK880...

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