SAnSUi AU-5900 vs AU-7900 integrated amplifier vintage ?¿ soft battle 

The content of this video illustrates the difference between the two integrated amplifiers Sansui AU-5900 and AU 7900. At first glance, these two integrated amplifiers are almost the same, but in fact they are very different.
the difference is in the front panel buttons, the final amplifier transistor.

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