Color: As shown<br> Material: PC<br> Description Report Item Details:<br> Sugden SDA-1 amplification circuit<br> The full DC line has no coupling or feedback capacitors, and the sound is transparent and pleasant to the ear<br> Single operation JRC5534DD for core amplification<br> The output stage adopts Class A design with 10mA Class A current<br> All components<br> Using 4 twin field tube inputs<br> KOA hifi resistor<br> 2mm thick printing plate, 70um thick copper<br> Using American ALPHA soldering wire for welding<br> Basic parameters:<br> Size: 92 * 102mm<br> Voltage: ± 12-17.5V<br> Input impedance: 220K ohms<br> AP test parameters:<br> Output effective value: 11.0V<br> Channel gain: 10.6dB 3.4 times<br> Signal to noise ratio: 132.5dB is impressive<br> Dynamic range: 133dB<br> Channel crosstalk: -97dB<br> THD distortion: 0.000092% very impressive<br> THD+N distortion: 0.00027%<br> Audio bandwidth: ± 0.039dB<br> Color: As Shown<br> Material: PC<br> Package Contents:<br> Preamplifier board x 1 (included potentiometer)<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.