Project Description

Evolution One – OP AMP phono preamplifier

The Evolution Phono One is entry level OP AMP based phono preamplifier with separated MC and MM inputs as well as possibility to choice MC input impedance.

Evolution One – Image gallery

Specifications

Gain : MM – 40 dB, MC – 64 dB using low hum J-Fet
Noise and Hum –  80 dB at MM , 76dB at MC
Output voltage 0.5 Vrms
Inputs: MM (RCA) – 47k/200pF , MC (RCA) – 10, 20, 50, 100 ohms selectable
Output Impedance : 600ohms
RIAA Accuracy : +/- 0.4 dB max below 1KHz , 0.6dB max above 1KHz
OP AMP  : OPA 2134  , two per channel
Power supply: Low Induction toroid transformer by Trafomatic Audio,
Requirements: 120V-60Hz/ 240V/ 50Hz switchable , 15 watts
Weight: 6 kg
Dimensions: 450x 320 x 100mm