EA4 – Revolutionizing Audio with L&P Circuitry × Pure Japanese Vacuum Tube Technology

To commemorate the 10th anniversary of the LUXURY&PRECISION Rakubi brand, the long-awaited high-power portable vacuum tube amplifier EA4 is finally here—following nearly two years of development.
The EA4 Limited, restricted to just 99 units worldwide, will be exclusively available for reservation and purchase through Fujiya Avic Nakano, Japan.

Bringing together a wealth of discrete analog design and custom circuitry, the EA4 introduces an industry-first level of personalization, ensuring optimal synergy with a wide range of IEMs and headphones.

🔹 Key Technical Highlights

Precision-tuned tube preamp stage with high-voltage supply directly to the anode for optimal tube performance.

Fully discrete constant current source circuitry for precise and linear operation.

Dual-mode configuration (ILA/ILH) combined with 2-stage input/output gain, allowing a total of four personalization modes.

12 Panasonic film capacitors used for coupling in the vacuum tube preamp stage.

Specially tuned linear regulators optimized for the natural resonant frequency of the tubes.

CNC-machined dual metal shielding and protective cover for vacuum tube shielding and safety.

Anti-resonance design with 8 high-damping silicone buffers on each side for vibration isolation.

Dual independent high-output positive/negative power rails for improved bandwidth and dynamics.

Discrete headphone amplifier power filtering via 16 Nichicon audio-grade 10×12.5mm aluminum electrolytic capacitors.

Selectable ±13V or ±15V power supply for the headphone amplifier stage.

Powered by six Panasonic 18650 low-impedance battery cells, selected and matched to ensure <0.5 mΩ of internal resistance difference.

The discrete headphone amplifier employs eight TO-252 power transistors.

Features 24 precision resistors (250mW / 0.5% accuracy) with low-temperature-drift alloy in the emitter path of large-signal transistors.

Switchable Class AB / Class A operation, with 11 steps of adjustable quiescent current levels.

Supports two modes of output architecture:
Pure Vacuum Tube Preamp Mode
Vacuum Tube Preamp + Discrete Headphone Amp Mod
Volume control design and potentiometer mechanism are evolved from the LP6Ti 7Anv system, offering refined performance.

Balanced headphone output power:
6,800mW @ 32Ω
1,200mW @ 300Ω

The EA4 is not merely an amplifier—it's a statement in modern audio engineering. With unmatched build quality, innovative discrete circuitry, and genuine Japanese vacuum tube integration, it redefines what is possible in portable high-fidelity audio.

※For pre-orders, please be advised that fulfillment will take a minimum of one month, as each unit is carefully prepared to meet our quality standards.