Can anyone find J201

bzdunowski said:
I have been looking for awhile but I am sure I dont know a lot of the sites to look at. If anyone can give me a link to someone who has these in stock I would appreciate it

www.taydaelectronics.com

J201 JFET N-Channel Amplifier Transistor

National - Get It Fast - Same Day Shipping
www.taydaelectronics.com www.taydaelectronics.com
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They don't make those anymore. You may get lucky on ebay (doubtful at this point since it's been a few years). What Betty Wont posted they DO still make, but they are surface mount rather than through-hole. PedalPCB sells these already soldered onto a small PCB and all you have to do is solder some leads to them to work on any PCB here.

2N5457 MAY work depending on the circuit.
1620842844849.png
 
I'm still using up the through-hole type. These are great! I've seen the pads on some of the newer boards for them. I think I'll give them a go.
 
Looks like the Six String Stinger has a place to solder the SMD J201's directly to the board, so you won't need the breakout board or pin headers if you can solder SMD parts.
 
fig said:
Which country are you shipping to?

2N2457 is sometimes a good sub.
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I remember RoG commenting on using the 2N2457 in place of the J201 in some of thier Amp Circuit modelers as they have less gain and are more realistic in terms of gain for the Classic Fender and Marshall circuits.
 
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I used to pay the premium for the though hole J201’s but I heard the SMD ones are tighter tolerance so I tried them out on my last build (like the ones above, pre-soldered to a little board). I just added solid core wire to the holes so I could mount it on the main pcb as normal.

for some reason it didn’t occur to me to bend them down like that so they’re stuck up at odd angles on my build, to go around the other parts on the pcb, but given the availability and extremely low chance of fakes (I would assume given they’re still in production), I’m gonna use them on all future builds that require J201’s.

in fact maybe I should stock up in case the SMD J201’s get discontinued.
 
I haven't checked the schematic before my previous message. I assumed it's an ordinary gain stage (Fetzer type), but turns out it's a Mu stage.
So it looks like that with a Mu stage there's not much difference between J201 and 2N5457.
Here's the comparison - Mu amp vs Fetzer. J201 vs 2N5457.
1620857962795.png

fig - Fetzer type circuit is a typical jfet gain stage and as you can see above, there's quite difference in gain between J201 and 2N5457.
 
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