BRAVO AUDIO BRAVO 1 DELUXE TUBE DRIVEN HEADPHONE MAP WITH EH TUBE Great sounding tube driven headphone amp for IPods and all music sources. Upgraded electro-harmonix EH 6922 Tube Warm and vibrant sound. Bring your music back to life! There is NO OP amp or IC in this circuit, which can introduce unexpected distortion to the sound Pure Class A amplifier with Audiophile Performance