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Estimated price (community-sourced)
About the HP4
The EAR Yoshino Ltd. HP4 is a high-end, class A triode headphone amplifier designed by Tim de Paravicini for driving both high- and low-impedance headphones with very low distortion. It uses four 6SL7 valves and transformer-coupled input/output circuitry, and is known for its ability to deliver nearly 1W of power while also providing balanced and unbalanced connectivity plus a pass-through path to a power amplifier for headphone and loudspeaker listening. Current retail listings show it as a rare or special-order product, with pricing varying by region and dealer; a Canadian dealer lists it at CAD 7,000, while other listings show different market prices. The original EAR documentation also emphasizes reliability, with valve life in excess of 10,000 hours.
Specifications
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