Phasemation EA-320 Phono Amplifier

MM/MC non-feedback phonostage with dual inputs, selectable playback curves, degauss, and shunt-regulated power

The EA-320 is an all-discrete, full-stage symmetrical non-feedback phonostage that draws on Phasemation’s upper-tier designs. A rigid enclosure uses a 10 mm slanted aluminum front panel with 1.2 mm steel base and cover, plus heavy metal feet help suppress vibration and preserve low-level detail.

It is similar to the EA-350, but without balanced inputs.

Its V-I/I-V conversion non-feedback equalizer architecture avoids correction-loop artifacts and is executed with high-precision passive parts in the RIAA network, including 1% metal-film resistors and silvered mica capacitors. The design objective is natural dynamics, tonal shading, and realistic musical expression.

The EA-320 has two RCA stereo inputs with independent MM/MC switching, a non-feedback two-stage CR low-cut filter to control woofer pumping from warped records, three playback curves (RIAA, DECCA Mono, Columbia Mono) and a degauss circuit for MC cartridges with metal cores. The power supply uses Rohm SiC diodes, Nichicon high-grade electrolytics, ELNA SILMIC II decouplers, low-noise Zener diodes, shunt regulators, and an R-core transformer for fast, low-noise performance.

Awards include Analog Grand Prix; MJ Technology of the Year 2021 (Analog Components); and Stereo Best Buy Components No. 1 in Phono Equalizer 100,000–500,000 JPY (2021, 2022, 2023, 2024).

Features

• 10 mm aluminum front panel; 1.2 mm steel base and cover; heavy metal feet
• All-discrete, all-stage symmetrical non-feedback equalizer (V-I/I-V conversion)
• Two inputs with independent MM/MC switching
• Non-feedback CR two-stage low-cut filter to mitigate woofer pumping
• Three playback curves: RIAA (stereo), Mono1 (DECCA), Mono2 (Columbia)
• Degauss circuit for MC cartridges with metal cores
• RIAA network uses 1% metal-film resistors and silvered mica capacitors (stereo)
• Rohm SiC diodes, Nichicon electrolytics, ELNA SILMIC II decouplers
• Low-noise Zener diodes, shunt regulators, and R-core power transformer

Specifications

Type: V-I/I-V conversion type all-stage symmetrical non-feedback equalizing amplifier

Inputs: MM stereo RCA, MC stereo RCA

Input Sensitivity (MM/MC): 2.5 mV, 0.13 mV

Input Impedance (MM/MC): 47 kΩ, 470 Ω

Gain (MM/MC): 38 dB, 64 dB

Input Conversion S/N Ratio (MM/MC): −120 dBV, −140 dBV

Rated Output Voltage (1 kHz): 200 mV

RIAA Curve Tolerance (20 Hz–20 kHz): ±0.5 dB

Power Consumption: 13 W

Dimensions (WHD): 11.26" x 3.66" x 9.92" (286 x 93 x 252 mm)

Weight: 8.6 lb. (3.9 kg)