Replacement for E402/J402/LS3954 JFET?
The 'E402' is an N-channel JFET pair in a single package. 2N3954 was its replacment, but not easy to find.

More here: http://analogue-heaven.1065350.n5.nabble.com/Moog-2N3958-replacing-E402-td29183.html

A few candidates:

NTE NTE461

From Linear Systems, LS3954

On Mouser, 2N3954:  It's $23. Ouch.