EA-1500 Tube Phono Preamplifier By Phasemation

The Phasemation EA‑1500 Phono Equalizer Amplifier is a high-performance vacuum tube phono stage designed to deliver exceptional musical detail and dynamic expression. Drawing on technologies developed for the flagship Phasemation EA‑2000 Phono Equalizer Amplifier, the EA-1500 combines advanced circuitry, dual-chassis construction, and premium components to reveal the full character of your vinyl system.

Designed for versatility, it supports balanced and unbalanced connections and works with a wide variety of cartridges—from MM and MC to the latest optical designs. With its carefully engineered power supply and refined transformer technology, the EA-1500 provides a clean, natural sound with outstanding resolution and depth.

Key Highlights

Flagship-Inspired Performance – Incorporates advanced design concepts derived from the EA-2000 for exceptional sound quality and musical realism.

Vacuum Tube, Non-NFB Circuit Design – A tube-based phono amplifier with a non-negative feedback architecture for fast response, natural tonality, and an expansive dynamic range.

Integrated Step-Up Transformer for MC Cartridges – Newly refined windings using high-purity PC-TripleC wire help deliver precise signal amplification and improved clarity.

Optical Cartridge Compatibility – Designed to support modern optical cartridges while maintaining excellent performance with traditional MM and MC designs.

Dedicated Dual-Chassis Construction – The amplifier and power supply are housed in separate enclosures to reduce noise and improve signal purity.

Balanced & Unbalanced Connectivity – Equipped with both XLR and RCA inputs and outputs for flexible integration with a wide range of audio systems.

Carefully Tuned Mechanical Design – Vibration-reducing feet and acoustically optimized structural components help preserve the integrity of the audio signal.

Premium Components Throughout – Gold-plated connectors and high-quality relay contacts contribute to reliable performance and refined sound reproduction.

Advanced Design for Performance and Usability

The EA-1500 features a dual-chassis layout that separates the amplifier circuitry from the power supply for improved noise isolation and easier installation. The dedicated power supply uses a three-transformer configuration with a vacuum tube rectifier, helping provide stable, clean power to the audio circuits.

Multiple connection options allow seamless integration with a wide range of high-end audio systems. In addition to MM and MC cartridge support, the amplifier also accommodates optical cartridges and includes mono playback modes and a demagnetization function for enhanced vinyl playback flexibility.

Engineering Philosophy

Developed to carry forward the sonic heritage of Phasemation’s reference models, the EA-1500 combines proven circuit technologies—such as LCR-type equalization and carefully shielded transformer structures—with modern cartridge compatibility. The result is a phono stage capable of revealing the nuance, depth, and musicality contained in vinyl recordings from systems around the world.

Key Features of the Phasemation EA-1500

Advanced Sound Quality Inspired by Flagship Technology

The Phasemation EA-1500 Phono Equalizer Amplifier incorporates design concepts developed for the flagship Phasemation EA-2000 Phono Equalizer Amplifier. Technologies such as the LCR-type equalization circuit and carefully shielded transformer structures contribute to a refined, highly detailed sound presentation that reflects Phasemation’s long-standing expertise in phono amplification.

Vacuum Tube Design with Non-NFB Circuitry

Built around a high-voltage vacuum tube architecture, the EA-1500 delivers impressive dynamic range and natural musical expression. The non-negative feedback (Non-NFB) circuit design helps maintain fast signal response and preserves the subtle nuances of vinyl playback.

Step-Up Transformer for MC Cartridges

For moving-coil cartridges, the EA-1500 features a specially redesigned step-up transformer derived from the Phasemation EA-1200 Phono Equalizer Amplifier platform. Its newly refined windings use highly regarded PC-TripleC wire, helping achieve excellent signal integrity and compatibility with a wide variety of cartridges.

Support for Modern Optical Cartridges

In addition to traditional MM and MC cartridges, the EA-1500 is designed to work with newer optical cartridge systems. A dedicated transformer provides stable power for optical cartridge operation without interfering with the main phono circuitry. An XLR input is also included, allowing optical cartridge outputs to connect using standard balanced MC cables.

Dual-Chassis Design with Dedicated Power Supply

The EA-1500 features a separate power supply chassis designed to minimize interference and improve sonic purity. Inside, a three-transformer configuration powers the system, including independent transformers for the left and right channels. A vacuum tube rectifier using 5U4GB tubes helps deliver clean power with reduced switching noise compared to typical semiconductor rectifiers.

Balanced and Unbalanced Connectivity

For system flexibility, the EA-1500 includes both balanced (XLR) and unbalanced (RCA) inputs and outputs. Premium NEUTRIK XLR connectors and gold-plated RCA terminals are used throughout to support reliable connections and high-quality signal transfer. Balanced and unbalanced outputs can also be used simultaneously.

Carefully Tuned Mechanical Construction

The chassis design and structural components have been acoustically optimized to minimize vibration. Hybrid metal insulators help reduce resonance, while the 1.6 mm thick top cover features a low-dielectric coating to reduce magnetic distortion and maintain signal purity.

Premium Components for High-Fidelity Playback

Gold-plated connectors and high-quality relay contacts are used throughout the unit to help ensure stable performance and accurate audio reproduction.

Stereo Sound Grand Prix 2025

• Input Sensitivity : 2mV (MM), 0.1mV (MC)
• Recommended Cartridge Impedance : > 47kΩ (MM), 1.5～40Ω (MC)
• Gain : 40dB(MM), 66dB (MC)
• Input Equivalent S/N Ration : -120dBV (MM) , -146dBV (MC)
• RIAA-equalisation curve accuracy : ±0.5dB (20～20kHz)
• Rated Output : 200mV (1kHz)
• Power Consumption : 70W (100VAC 50/60Hz)
• INPUT terminals : MC/MM(RCA x2, XLR x 2, OPT(RCAx1, XLR x 1(Unbalanced))
• OUTOUT terminals : RCA x 1, XLR x 1
• Dimensions / Weight:
  • Amplifier　430 (W) x 93 (H) x 359 (D) mm, 9kg
  • Power Supply　430 (W) x 93 (H) x 346 (D) mm, 12kg

Technical Information