Choosing The Right Transistors

Lesson Overview: Choosing The Right Transistors

In this lesson, we focus on a crucial aspect of circuit voicing: how to choose and measure the right transistors for your build—especially in a DIY context.

You’ll learn:

• What really matters when selecting transistors for audio: gain (hFE), leakage, noise, and response.
• The sonic impact of different transistor types (NPN vs PNP, silicon vs germanium).
• Why datasheets don’t always tell the full story—and how to test for yourself.
• DIY-friendly methods for measuring transistor gain and matching components, using just a multimeter or basic testing rig.

You’ll also get real-world advice on sourcing reliable transistors and avoiding eBay fakes.

By the end of this lesson, you’ll know how to evaluate and hand-pick transistors like a tone scientist—using accessible tools and grounded methods.