Loftin-White Circuit

The Loftin-White circuit is a special type of Single-Ended (SE) Class A tube amplifier design, developed by engineers Loftin and White in the early 20th century. It is known for its direct coupling between amplifier stages, eliminating the need for interstage capacitors, which are traditionally used for signal transmission between stages.

Direct Coupling:

• In conventional tube amplifiers, signal transmission between stages is typically achieved using capacitors or transformers.
• In the Loftin-White circuit, the preamp tube is directly connected to the grid of the power tube, utilizing a proper voltage offset.

Stable and Pure Signal:

• Eliminates phase shifts and frequency distortions that capacitors might introduce.
• Provides a clean, detailed, and naturally musical sound with minimal modifications to the original signal.

Simpler but More Precise Circuit:

• Reduces the number of components in the signal path, helping to minimize interference and noise.
• However, precise component selection and careful construction are crucial for proper operation.

✔ Cleaner and more natural sound – fewer signal alterations between tubes.
✔ Fewer components – simpler design but requires greater precision.
✔ Minimal phase shifts and interference – more stable and transparent sound.

This circuit is particularly popular among audiophiles seeking maximum sound purity and musical expression. It pairs exceptionally well with high-sensitivity speakers, delivering a warm, detailed, and naturally flowing audio experience.

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