LL2754: Lundahl Headphone Output Transformer

The LL2754 is available in 2 versions to suit the circuit topology. (The air-gap is adjusted during manufacture to suit)

• Push-Pull
• Single-ended

(N.B. The purpose of the airgap is to accept the DC current of the output valve without saturating the core, leaving enough headroom for the sound signal)

There are further 3 versions depending on what C-core material you require.

• Silicon-iron (STANDARD)
• Amorphous-iron (AM)
• Nanocrystalline (NC)

Turns ratio

• 1 + 1 : 1 + 1

Depending on how the winding sections of the transformers are wired together via the exposed solder pins, the constructor can adjust the following primary and secondary impedances.

Primary impedance: Secondary impedance turns ratio

• 1:1 for low-impedance headphones (32R to 50R)
• 1:2 for high-impedance headphones (300R to 600R)

For more information on this product, please click HERE