Sennheiser Orpheus HE90 + HEV90 Complete System – Rare Collector’s Set

Up for sale is a complete and original Sennheiser Orpheus HE90 electrostatic headphone + HEV90 tube amplifier system. Produced in the early 1990s in only ~300 units, the Orpheus remains one of the most coveted and revered headphone systems ever built. Condition • HE90 headphones: Very good overall. Original pads and headband show cosmetic aging but remain intact. • HEV90 amplifier: Excellent cosmetic condition. Tubes, solid walnut side panels, polished stainless-steel chassis, and Carrara marble front section are well preserved. Worked flawlessly when last used. • Due to age, a service by Sennheiser is recommended for optimal performance. Construction & Materials • Solid walnut side panels • Polished stainless steel chassis and covers • Carrara marble front section beneath the tube array • HE90 uses a 1 µm gold-plated diaphragm with glass electrodes (electrostatic) Technical Specifications HE90 Headphones • Frequency response: 7–100,000 Hz (-10 dB); 14–85,000 Hz (-6 dB); 25–75,000 Hz (-3 dB) • Diffuse-field equalized response • THD: < 0.1% at 110 dB SPL • Nominal sensitivity: ≥ 98 dB @ 1 kHz • Polarization voltage: 500 V • Weight (without cable): 365 g • Cable: 3 m, 6-core OFC, gold-plated contacts, 5-pin HV plug • The HEV90 amplifier supports up to two HE90 headphones simultaneously, but only one HE90 headphone set is included here. HEV90 Amplifier • All-valve (vacuum tube) analog signal path • Integrated DAC (Burr-Brown, 64× oversampling design) • Frequency response: 10–20,000 Hz (-0.25 dB) • THD (1 kHz): < 0.01% • S/N ratio: ≥ 80 dB • Output voltage: 400 Veff • Inputs: Optical Toslink (switchable), coaxial digital (RCA), coaxial analog (RCA) • Outputs: Two HE90 headphone sockets • Weight: ~13 kg • Dimensions: 53 × 34 × 15.5 cm Included • One set of HE90 headphones (amp supports up to two, but only one headphone set is included) • HEV90 amplifier • Original cables Notes • Worked great when last used. Sold as-is due to age; buyer should anticipate routine service for long-term use. • Serious inquiries only. • Please also view my listings for the MFA Luminescence B-1C tube preamp and the Manley Ichiban monoblock amplifiers. Pickup Local pickup only in the San Gabriel Valley (Los Angeles area).

Condition

Used (normal wear)