Graham Slee Solo SRG II Headphone Amplifier

The Solo SRGII headphone amplifier is the refined version of Graham Slee's legendary "green" Solo.

Graham Slee Novo Headphone Amplifier

The budget Novo headphone amplifier has a delightfully lively sound.

Graham Slee Solo to Solo Ultra Linear Upgrade

Upgrade your previous version Solo to Ultra Linear spec!

Graham Slee Voyager Portable Headphone Amplifier

What makes the Voyager so popular amongst hi-fi headphone amplifiers is its wonderful big headphone-amp sound, and that it can take the knocks.

Graham Slee Solo Ultra Linear Headphone Amplifier with PSU1

The Solo Ultra-Linear lifts the performance of any good music source and quality dynamic headphones.