The rare TU-X501 is a small black digital synthesizer AM/FM tuner that is the little brother of the excellent TU-X701. We’re trying to figure out why we thought the 501 has Sansui’s “SLDD” (Super Linear Digital Decoder) circuitry, which Sansui claims eliminates spurious frequencies – it apparently does not have SLDD (perhaps an error in Sansui’s marketing materials?). We don’t know much about it except that its features include Automatic Gain Control (AGC) with a pin-diode and a MOSFET that automatically adjusts the RF gain, Wide/Narrow bandwidth selection, a DX/Local switch, an FM noise canceler switch, and 20 presets.
Registration