Parts · Transistors

2N4391

Si N-ch JFET.2 circuits use this part.

Datasheet · from interfet.com

Substitutes N-channel JFET

Matched on material, polarity and the limits below from the transistor parameter database. Pinouts and packages are not in that data: check the datasheet before you drop one in, and expect gain to change the sound.

This part

Part	Vgs max	Id max	Vds	Pd
2N4391		150 mA	40 V	1.8 W

Used on other boards here

Part	Vgs max	Id max	Vds	Pd	Boards
2N4393		150 mA	40 V	1.8 W	1

Closest by the numbers

Part	Vgs max	Id max	Vds	Pd
2N4392		150 mA	40 V	1.8 W
2N4856A	10 V	50 mA	40 V	1.8 W
2N6659-SM		1100 mA	60 V	6.25 W

Faceplate	Circuit	Based on	Category	Vendor	Box	Knobs	Price	BOM
	Basic Saw VCO 2N4391 · CA3140 · LM319 · MAT04	—	Ring Mod / Synth	Experimentalists Anonymous	—	2	—	34
	Oberheim 2 Voice Keyboard 2N3905 · 2N4391 · 2N5172 · 536	—	Ring Mod / Synth	Experimentalists Anonymous	—	2	—	56