MPF4393 alternatives? Wanna build a Formula 5F6

[HamishR]

I see that Bugg now has a board for a Formula 5F6 for sale - "Tweed Man".  Is there a Jfet suitable as an MPF4393 alternative?  I looked and they are stupid expensive!  Is that really what is in a Formula 5F6?

[GrooveChampion]

Well to be fair they are sold on Ebay...and I just ordered some......

If I am correct the J201 and 2N5457 can work

[HamishR]

Cool!  Thanks.  I might try some 2N5457s - I have some of those.  Also discovered that 2N4393 might work, but they're not that much cheaper.

[anders]

Also, don't forget PN4393, still reasonable cheap and avaiable. I have some in my Catalinbread SFT II clone that calls for MPF4393. Works great!

[Muadzin]

GrooveChampion wrote

Well to be fair they are sold on Ebay...and I just ordered some......

If I am correct the J201 and 2N5457 can work

Avoid anything that is out of production being sold on eBay like the proverbial plague. Chances are you're just going to get fakes. Get SMD JFET's instead with adapter boards. A bit of a pain to solder, but still less of a pain then dealing with fakes.

[GrooveChampion]

Well, I guess I'll see it for myself, honestly I was lucky with trannies from Ebay so far.....god that sounds wrong....

[Dex3887]

there is an ebay seller selling 20 of the smd 4393 for stupid cheap(ie~$6) shipped and the adapter boards are cheap by the sheet on ebay or from paul(chromsphere) at diygp. they are far more reliable and consistent, I had originally bought them for the Sabbra Cadabbra, but they work in all kinda builds. Really Neutral  sounding as well, not bright, but not dark either, VGS(off) hovers around -1.30V in mine