Tube designs have always been a staple of Manley Labs. Now with the launch of a new hifi-focused line of products, the first unit off the bench for the pro-side leaning company is the Absolute headphone amplifier, which compiles much of the analog know-how from the US-based company’s years of experience. In this interview with EveAnna Manley and designer Zia Faruqi we cover off all the bases in terms of what to look for in a well-built tube amplifier in the personal audio space.