The Ultimate Flagship Tube Headphone Amplifier Allnic proudly presents the HPA-15000 OTL/OCL , our uncompromising flagship tube headphone amplifier — a true milestone in the pursuit of sonic purity and high-end headphone performance. This revolutionary amplifier redefines the limits of tube design with its OTL (Output Transformer-Less) and OCL (Output Capacitor-Less) architecture, completely removing output transformers and capacitors from the signal path. The result is unmatched clarity, free from distortion, coloration, and energy loss . Building on the legacy of the acclaimed HPA-10000 , the HPA-15000 has been entirely reengineered from the ground up, featuring a newly designed vacuum tube topology that pushes headphone listening to a new level of musical immersion. From jazz and classical to electronic and rock, the HPA-15000 delivers effortless control , breathtaking detail , and a noise floor so low it disappears into the music — making silence part of the performance. If you seek the ultimate expression of headphone amplification , the HPA-15000 OTL/OCL isn’t just a headphone amp — it’s a new standard in listening . OTL/OCL Architecture Eliminates both output transformers and coupling capacitors Achieves absolute signal purity with no distortion or bottlenecks Massive Output Power Delivers up to 10W of pure tube output Drives headphones ranging from 15Ω to 600Ω Flexible Connectivity 4 headphone outputs : • 2 × 6.3mm TRS (unbalanced) • 2 × 4-pin XLR (balanced) RCA pre-out for use as a high-gain tube preamplifier (+16dB) 5 analog inputs : • 3 × RCA • 2 × XLR Premium Volume Control 61-step fixed impedance attenuator (CIA – Constant Impedance Attenuator) The same attenuator used in Allnic’s flagship preamplifiers Maintains tonal integrity and dynamics across the entire volume range Meticulous Tube Topology ECF802 (triode/pentode) – first-stage voltage amplification and feedback 6414 (dual triode) – phase inversion and driver stage 6C41C (triode) – SEPP (Single-Ended Push-Pull) output stage For the True Connoisseur The HPA-15000 OTL/OCL is crafted for those who demand more than performance — for those who listen not just with their ears, but with their soul . A reference amplifier for the most discerning audiophiles. Category Specification Vacuum Tubes 6C41C × 4 6414 × 2 ECF802 × 2 Output Power 10W Output Impedance 15Ω – 600Ω Voltage Gain +32dB Headphone Outputs 6.3mm TRS × 2 4-pin XLR × 2 Analog Inputs RCA × 3 XLR × 2 Pre-Out RCA (L/R) Frequency Response 20Hz – 20kHz (±0dB) Dimensions (W × H × D) 43 × 21.5 × 39cm (17 × 8.5 × 15.5 inches) Weight 17.6kg (39 lbs)
