Fidele Audio
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Fidele Audio
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NAD 3130 Service Upgrade Details. The main power supply capacitors (originally 2 x 6800uF) are replaced with 2 15000uF capacitors. These supply the output stages of the power amplifier and the increase in capacitance provides more definition and presence to the bass sound. All electrolytic capacitors in the regulated supply are replaced with double the capacitance, this provides a less noisy supply thus reducing overall noise and distortion and contributing to a tighter clearer sound. All electrolytic capacitors in the pre and power amplifier circuits are replaced with non-polarised electrolytic capacitors and the pre amp Op Amp is replaced with a OPA2227. This has a significant effect on overall distortion levels especially where the capacitors have bi-polar signals applied. This contributes to a clearer cleaner sound especially in the mid to higher frequencies. The driver and output transistors are replaced with modern transistors which have much better sonic properties than the originals, and also provide more power handling capabilities. A small modification is made to the bias circuit to allow exact setting of bias currents. Finally the offset voltage and bias currents are set as accurately as possible, to provide the final polish to the amplifiers sound. The effect of all the work is to significantly improve the bass response and improve the overall clarity of the sound, by reducing noise and distortion throughout the amplifier. Click Here to see some images of an upgraded amplifier |
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