Ortofon Phono EQ Amplifier EQA-333

Description

Ortofon Phono EQ Amplifier EQA-333: Full Description and Specifications

The Ortofon EQA-333 is a compact phono equalizer amplifier designed to enhance the sound quality of both Moving Magnet (MM) and Moving Coil (MC) cartridges. It aims to provide a high-performance solution that complements Ortofon's range of cartridges, especially their low-impedance MC models. Key Specifications:

• Input Sensitivity:
  • MC: 250 µV / 47 Ohm
  • MM: 2.5 mV / 47 kOhm
• Output Voltage: 250 mV / 300 Ohm
• RIAA Deviation: ± 0.5 dB (20 Hz - 20 kHz)
• Signal-to-Noise Ratio (IHF-A correction):
  • MC: 85 dB
  • MM: 95 dB
• Power Supply Voltage, Power Consumption: AC 16 V 50/60 Hz, 3 W (External AC adapter)
• Dimensions (W x H x D): 123 x 65 x 140 mm
• Weight: 1.06 kg
• Inputs:
  • 1 x RCA (MM)
  • 1 x RCA (MC)
• Outputs: 1 x RCA

Key Features:

• MM/MC Compatibility: Offers separate input circuits optimized for both Moving Magnet and Moving Coil cartridges, providing flexibility for different turntable setups.
• Optimized for Low-Impedance MC Cartridges: The MC head amplifier circuit is specifically designed to match the characteristics of Ortofon's low-impedance MC cartridges.
• Low-Noise FET Input (MC): Employs a differential input circuit using a high-gm, low-noise FET (Field-Effect Transistor) to ensure stability, wide bandwidth, and low distortion for MC signals. Two FETs are used in parallel to improve the S/N ratio with low-impedance cartridges and achieve low-noise at a gain of 20 dB.
• Low-Noise FET Input Operational Amplifier (MM): The MM input circuit utilizes a low-noise, high-gain, high-slew FET input operational amplifier.
• NF-Type Equalizer Circuit (MM): The equalizer circuit for the MM input is an NF (Negative Feedback) type, known for its natural sound quality. It provides a gain of 40 dB for MM signals.
• High-Quality Components: Features metal film resistors, which are advantageous for sound quality and S/N ratio.
• Reliable PCB: Utilizes a highly reliable double-sided glass substrate (Printed Circuit Board).
• Gold-Plated Terminals: Input/output RCA and GND terminals are gold-plated for optimal signal transfer and corrosion resistance.
• External Power Supply: Employs an external power supply (AC adapter) to minimize potential noise interference within the amplifier.
• Compact Design: The small footprint allows for easy placement within an audio system.