Product Description
The Evolution Phono One is Trafomatic's entry level phono preamplifier, but there is nothing really "entry level-ish" about it though, other than its relatively accessible price. It is an OP-AMP based phono preamplifier with separate MC and MM inputs, as well as the possibility to select between six MC input impedances.
We could have gone the tube-circuit route, but given that it was likely to be paired with our Evolution all tube Evolution Line One Preamplifier or another tube line stage... and an all tube Integrated amp, we decided to take a stroll down "Solid State Avenue" to see what we could conjure up. It turned out that the OPA 1231 J-Fet reacted really well when introduced into the circuit design principles used for our tube components, The end result was well worth the "detour"!
In essence, the Evolution Phono One's circuit represents an expression of "purist simplicity" ... a simplicity that was then "refined" by carefully selected very high quality parts, and by careful attention to circuit layout and the critical power supply stage. It uses two Burr Brown OPA 1231 OPAs per channel, one for RIAA equalisation and the other for amplification.
Standard finish is black, but any RAL colour is possible by request (additional cost).
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: 450 x 320 x 100mm
