Tube Tranny | Free

: Transformers can introduce magnetic hysteresis and phase shifts that color the sound.

: A fully symmetrical output stage favored by brands like Atma-Sphere to lower output impedance. 5. Summary Comparison OTL Amplifier Design - Tube CAD Journal tube tranny free

: They perform best with high-impedance speakers (e.g., 16 ohms or higher) or headphones. 4. Notable "Tranny Free" Technologies : Transformers can introduce magnetic hysteresis and phase

: A modern approach by Linear Tube Audio that uses high-frequency carrier waves to mimic a transformer’s impedance matching without the actual iron core. Summary Comparison OTL Amplifier Design - Tube CAD

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

: They require specific "current pusher" tubes with low plate resistance, such as the 6AS7, 6080, or 6336 .

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