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.
