The amplifier stage is built around ruggedized 6N3P-EV vacuum tubes. We use only carefully selected New Old Stock (NOS) tubes manufactured in the mid-1980s — components from the golden era of analog audio. Known for their exceptional reliability, these tubes offer an operating life of up to 5,000 hours. Their sound is rich, detailed, and harmonically complex, delivering the warmth, depth, and unmistakable character that have made vintage tube equipment legendary.