NPN - PNP - JFET Suggestion

[lochheed]

Hello -

I'd like to improve upon a few NPN, PNP, JFET and OP-AMPs in one of my stompoxes. I need a little more fidelity and hopefully, clarity.

I was able to pull a few part numbers and descriptions from a rough schematic.

1. 2N4124 NPN GENERAL PURPOSE AMPLIFIER SWITCHING Xstr T&R
2. J113A JFET N-CHANNEL RDS (ON) <80 ohm VGS (off)
3. 2N4125 PNP GENERAL PURPOSE AMPLIFIER SWITCHING Xstr
4. LF353M DUAL OP-AMP SMT
5. NJM4560 DUAL OP-AMP SMT SOIC

Any Suggestions?

Adam