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Low Voltage MM Phono Preamp: A Balanced tweaking
A small arrangment on the Battery Powered MM Phono Preamp PCB can transform this single-ended unit in a balanced one with a further improvement of technical and sonical performances. Additive requirements for the buildind are 2 SOT1 units and 2 E188CC-SQ double-triodes.
Fig. 1 shows the simulated preamp. This schematic includes also an Inverse RIIA network used for the RIIA accuracy monitoring.
Highlights
Min Accuracy 0.34db
Fmin (3db) = 18Hz
Fmax (-3dB)=76kHz
| Fourier components of V(out1) | Vin=250mVp | ||||
| DC component:0.0627249 | |||||
| Harmonic | Frequency | Fourier | Normalized | Phase | Normalized |
| Number | [Hz] | Component | Component | [degree] | Phase [deg] |
| 1 | 1,00E+06 | 4,79E+03 | 1,00E+03 | 166.98° | 0.00° |
| 2 | 2,00E+06 | 2,74E+01 | 5,72E+00 | -97.14° | -264.12° |
| 3 | 3,00E+06 | 2,60E+02 | 5,43E+01 | 143.16° | -23.82° |
| 4 | 4,00E+06 | 9,25E+00 | 1,93E+00 | -16.70° | -183.68° |
| 5 | 5,00E+06 | 3,32E+01 | 6,94E+00 | -52.87° | -219.86° |
| Total Harmonic Distortion: 5.506975% | |||||
| Fourier components of V(out2) | Vin=250mVp | ||||
| DC component:-0.0627259 | |||||
| Harmonic | Frequency | Fourier | Normalized | Phase | Normalized |
| Number | [Hz] | Component | Component | [degree] | Phase [deg] |
| 1 | 1,00E+06 | 4,79E+03 | 1,00E+03 | -13.02° | 0.00° |
| 2 | 2,00E+06 | 2,74E+01 | 5,73E+00 | 83.44° | 96.46° |
| 3 | 3,00E+06 | 2,60E+02 | 5,43E+01 | -36.84° | -23.82° |
| 4 | 4,00E+06 | 8,97E+00 | 1,87E+00 | 163.44° | 176.46° |
| 5 | 5,00E+06 | 3,32E+01 | 6,94E+00 | 127.13° | 140.14° |
| Total Harmonic Distortion: 5.506876% | |||||
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