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GM 20 | GM 13.5B | WFB ONE | VT 5.35 | |
| GM 70 | GM 50 | Modena |
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Italy
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gRAAF s.r.l. |
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| Pre Amplifier | GM 13.5B II • | WFB ONE • | GM 70 • | |
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GM 70 - 唱頭放大器
GM 70 使用低噪音、單三極管 Telefunken PC 900（4HA5），作為唱頭輸入前前級放大；RIAA 等化網路則以被動形式呈現，並以雙三極管 6922 成增益級與緩衝輸出。
GM 70 共可切換六種不同的輸入阻抗，並設計了額外的 RCA 端子，用以外加並聯電阻，以得最佳之阻抗匹配；前前級也可切換兩種不同的增益（High/ Low），以得最廣效之唱頭選用。 |
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Layout within GM 70 |
Rear Setup of GM 70 |
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GM 70
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Function
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Phono Pre
Amplifier
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Frequency response |
20Hz to 20KHz 50KHz attenuation: 28dB 100KHz attenuation: 34.8dB |
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Input impedance |
adjustable on 38-56-100-500-1K Ohms 47K Ohms (Load Position) |
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High gain |
56dB S/N ratio: 73dB (A weighted, ref. 2V output) separation: 60dB |
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Low gain |
46dB S/N ratio: 82dB (A weighted, ref. 2V output) separation: 70dB |
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Using tubes |
Telefunken PC900(4HA5) x 4 in input stage 6922(E88CC) x 4 in gain/ buffer stages |
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Mains
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120 V, 60 Hz
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Power dissipation |
W |
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Dimensions |
410 mm * 105 mm * 420 mm (W * H * D) |
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Weight |
10Kg |
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Finish |
Ferrari Black |
