Because tubes naturally operate at high voltages and low currents—while speakers need the opposite—"tranny free" designs are complex to build:

Removing the transformer addresses several inherent technical limitations found in traditional designs:

: Indicates the total absence of these transformers in the signal path. 2. Why Go Transformerless?

: Common industry slang for a transformer (not to be confused with transistors).

: Eliminating several pounds of iron and copper makes the units significantly lighter. 3. Key Design Challenges

: They perform best with high-impedance speakers (e.g., 16 ohms or higher) or headphones. 4. Notable "Tranny Free" Technologies