The tube pre-amplifier uses a cow-in cow-out transformer, a set of four. Input two 600Ω: 60K transformers, output two 5K: 20K transformers.
600:60K Z11 iron core input step-up transformer, voltage ratio is 1:10. That is to say, the input voltage of 600V is 1V, and the output voltage of 60K winding is 10V. The signal is boosted and amplified 10 times. Transformer cores are inserted in pairs, passing AC signals.
This audio step-up transformer inputs 2 lines and outputs 2 lines. Z11 transformer core size: EI57 stack thickness 35mm, fixed by Red Bull clip, high purity oxygen-free copper and copper enameled wire winding.
Measured parameters:
Primary DC resistance: 47Ω
Secondary DC resistance: 470Ω
Primary inductance: around 1.35H 100HZ
Secondary inductance: around 140H 100HZ
Over signal current 25mA DC withstand voltage: 800V
Frequency response: 10Hz～16KHz -3dB
The resistance and inductance parameters are subject to the VICTOR 4090B desktop digital precision bridge test. Paired for sale.
Other specifications can also be customized as required.
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Tube 5K: 20K single-ended push transformer. The voltage ratio is 1:2, 2 times boost. High-quality EI57×35 Z11 iron core, fixed by British Red Bull clip. High-quality oxygen-free copper enameled wire winding, nylon skeleton. The iron core of the transformer is inserted into the pad paper, and the AC signal is straightened. Input 2 lines, output 2 lines.
5K:20K promote the transformer parameters:
Primary average copper resistance: about 676Ω
Secondary average copper resistance: about 1355Ω
Primary average inductance: about 15H 100HZ measured
Secondary average inductance: about 60H 100HZ measured
Over signal current 25mA DC withstand voltage: 800V
Frequency response: 20Hz-39KHz -1.5DB
test instrument:
Signal generator: Japan LEADER LAG-120A
Level Meter: Japan KENEOOD VT-186
Oscilloscope: Japan KENEOOD CS-5175 100MHz
Paired for sale.
Other specifications can also be customized as required.
Quality assurance, one year warranty.
The inductance value will be different according to the test frequency point, the inductance value is low and the inductance is high, and the inductance value is high and the inductance is small. This product is subject to the VICTOR victory 4090B desktop digital precision bridge test. If you have an instrument, you can verify it by yourself.
