AM/FM Stereo Tuner RT-725

Roland Electronics Co. Ltd., Rotel; Tokyo

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  • Year
  • 1977 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 258190

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • Superheterodyne (common)
  • Wave bands
  • Broadcast (BC) and FM or UHF.
  • Details
  • Hi-Fi equipment
  • Power type and voltage
  • Alternating Current supply (AC) / 120; 220; 240 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: AM/FM Stereo Tuner RT-725 - Roland Electronics Co. Ltd.,
  • Shape
  • Book-shelf unit.
  • Notes

  • An AM/FM stereo hi-fi tuner housed in a metal case covering MW, FM mono and FM stereo. With an FM Tuning meter, Signal Strength Tuning meter, rotary Output Level control, switches for Muting and Hi-Blend filter, an adjustable AM ferrite bar aerial on the back, terminals for AM and FM antennae, RCA phono sockets for Fixed and Variable Line Output and for FM Detector Output.

    Specification  
    FM Tuner Section  
    Usable Sensitivity  
     Mono
     Stereo    		 10.3dBf (1.8µV/300Ω)
    18.2dBf (4.9µV/300Ω)
    Signal-to-Noise Ratio (at 65dBf)  
     Mono
     Stereo    		 70dB
    65dB
    Distortion (at 65dBf)  
     100Hz & 1kHz
     6kHz    		 0.2% (mono), 0.3% (Stereo)
    0.3% (mono), 0.4% (Stereo)
    Frequency Response 30Hz - 15,000Hz +0.2dB,-1dB
    Capture Ratio 1.5dB
    Alternate Channel Selectivity 70dB
    Stereo Separation 30dB (30Hz - 15kHz)
    Antenna Input 300Ω balanced
    75Ω unbalanced
    AM Tuner Section  
    Sensitivity 240µV/m (IHF, Ferrite antenna)
    12µV (IHF, ext. antenna)
    Selectivity 40dB
    Signal-to-Noise Ratio 55dB
    Antenna Built-in ferrite loopstick antenna

    Versions/Power requirements
    120V AC 60Hz
    220V AC 50Hz
    240V AC 50Hz
    120, 220, 240V AC 50/60Hz (switchable)

    Power consumption:  20 watts max.

  • Literature/Schematics (1)
  • - - Manufacturers Literature (Owner's manual RT-725)
  • Literature/Schematics (2)
  • - - Manufacturers Literature (Technical manual RT-425 RT-725 dated Dec 1977)
  • Author
  • Model page created by Franz Scharner. See "Data change" for further contributors.

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