Radio Design Labs ST-PH1
Stereo Phono Preamplifier

OUR PART #  STPH1


Radio Design Labs' ST-PH1 is a stereophonic phono preamplifier. Each of the two channel circuits is identical. The ST-PH1 has standard 47 kohm impedance unbalanced phono cartridge inputs. Equalization follows the RIAA curve. Each output is capable of driving balanced or unbalanced, high or low impedance loads.

RDL's SupplyFlex power input configuration is included in the ST-PH1. The power supply input may be fed from a floating (not ground-referenced) 24 Vdc power source, from a bipolar power supply (+/- 12 Vdc or +/-15 Vdc) or from a ground-referenced 24 Vdc power supply.

The output is capable of driving into either high or low impedance loads. And the output may be connected either balanced or unbalanced. The ST-PH1 features superior circuitry which produces the unsurpassed pure clarity for which Radio Design Labs products are known!

NOTE: Radio Design Labs' PS-24AS power supply is NOT included but is required in order to power this product.  Please see the "Accessories" tab or click here for more information on the PS-24AS power supply.

Features:

  • Input matched to standard cartridges used in theindustry
  • Impeccable audio quality
  • Ultra-low distortion and noise
  • Adjustable output levels (Independent adjustment forboth channels)
  • Ample headroom at operating level
  • Short circuit protection on outputs
  • Positive connections via barrier block - no audio connectors to wire

Although phono inputs are provided on some equipment, optimum system performance is obtained when phonographs are preamplified as close to the turntable as possible, and then the line-level signals are fed to the next equipment in the chain. The convenience of the ST-PH1 is ideal for all such applications.

Specifications:

  • Inputs: 47 kohm unbalanced
  • Gain (1kHz): 50 dB (adjustable +/-10 dB)
  • Output: 300 ohm to drive low or high impedance balanced or unbalanced lines
  • Output Signal: +4 dBu nominal, adjustable; unbalanced output 6 dB below balanced line level
  • THD (10Hz to 30kHz):
        * less than 0.030% Hi-Z Load
        * less than 0.015% 600 ohm load
  • Frequency Response: RIAA Curve
  • Noise below +4 dBu: less than -75 dB
  • Headroom above +4 dBu: 18 dB
  • Power Requirement: 24 to 33 Vdc @ 60 mA Ground-Referenced or Floating
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