2N5088 low-noise, high-gain NPN transistor in TO-92 package for audio and pedal circuits.Pedal-builder note: The 2N5088 is a classic choice for Electro-Harmonix Big Muff Pi builds and is also widely used in Ross/Dyna Comp-style compressor circuits.

2N5457 N-channel JFET in TO-92 package for high-impedance, low-current audio stages.Pedal-builder note: The 2N5457 is the original JFET used as the active compression element in the Dan Armstrong Orange Squeezer circuit. A strong choice for Orange Squeezer builds and restorations, as well as JFET buffers and other high-impedance guitar-pedal stages.

2N7000 N-channel MOSFET in TO-92 package.Pedal-builder note: Widely used in DIY stompboxes for MOSFET clipping and switching. It is a popular choice in modified Tube Screamer / OD-1 / SD-1-style clipping networks and in Zendrive / Fulldrive-inspired MOSFET clipping arrangements.

2N3904 general-purpose NPN transistor in TO-92 package.Pedal-builder note: A reliable general-purpose transistor for boosts, buffers and fuzz/drive stages. It is also a documented substitute in Colorsound Power Boost / Overdriver-style DIY builds.