Allnic/ZL Technologies HPA-15000 OTL/OCL

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 re-engineered from the ground up,
featuring a newly designed vacuum tube topology that pushes headphone listening to a new level of musical immersion.

In addition, Allnic offers an optional Direct Ribbon Headphone Terminal for RAAL
a dedicated 4-pin XLR male output directly connected to nickel-permalloy matching transformers with pure PC-silver wiring
This allows direct connection without the conventional RAAL interface box —
delivering an exceptionally fast, transparent, and open high-frequency sound, revealing a whole new dimension of realism.

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)
• Optional: RAAL Direct Ribbon Headphone Terminal — dedicated 4-pin XLR output directly linked to nickel-permalloy matching transformers with pure PC-silver wiring.
  No RAAL interface box required, delivering ultra-fast, transparent, and open sound.
• RCA pre-out for use as a high-gain tube preamplifier (+16dB)
• 5 analog inputs: 3 × RCA, 2 × XLR

🔹 Premium Volume Control

• 61-step Constant Impedance Attenuator (CIA) — same design as 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.
reference amplifier for the most discerning audiophiles.

If you want to experience Allnic Audio’s products,

please contact your local authorized dealers or

Audio Mentors, which is Allnic Audio’s design & marketing company.