• Country
• Great Britain (UK)

• Manufacturer / Brand
• Quad (Brand); Acoustical Manufacturing Co. Ltd.; Huntingdon

• Year
• 1982–1995

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 180370

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Superheterodyne (common)

• Wave bands
• FM Broadcast Band Only

• Power type and voltage
• Alternating Current supply (AC) / 100-127 / 200-240 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Quad Tuner FM4 - Quad Brand; Acoustical

• Shape
• Book-shelf unit.

• Dimensions (WHD)
• 321 x 64 x 207 mm / 12.6 x 2.5 x 8.1 inch

• Notes

• A hi-fi FM stereo tuner with a digital frequency display housed in a green metal case. With a rotary tuning control, push buttons for 7 preset radio stations and Tune (save to memory), automatic AFC and muting, bar graph signal strength and centre tuning indicators and FM stereo indicator. On the back, a 75 ohm FM coaxial antenna connector, DIN Line output socket and an unswitched AC outlet. The preset buttons on the UK model are marked with UK radio stations, on export models marked 1 to 7.

  Specification
  Frequency range	88-108MHz
  Sensitivity       30dB quieting	Mono 1µV (1.2dBf)
  50dB quieting	Mono 2.7µV (8dBf), Stereo 25µV (28dBf)
  Full Limiting	< 1µV
  Signal/Noise
  Input signal 1kHz  at 1mV 'A' weighted	Mono 76dB Stereo 70dB
  Distortion Input signal
  1kHz±75kHz	Mono 0.15%, Stereo 0.15%
  ±25kHz	Mono 0.05%, Stereo 0.10%
  Selectivity	53dB
  Capture Ratio	2.5dB
  IF Rejection	100dB
  AM Suppression	60dB
  Image Rejection	80dB
  Pilot Tone Suppression	60dB
  Crosstalk at 1kHz	40dB
  Frequency Response	20Hz-15kHz +0dB,-1dB
  Output Level 30% Modulation	100mV
  Source Impedance	100Ω
  Recommended Load Impedance	>20kΩ
  Aerial Input	75Ω unbalanced
  De-emphasis	50µs or 75µs

  Power requirements:  100-127V or 200-250V AC 50/60Hz with voltage selector switch
  Power consumption:   6VA

• Net weight (2.2 lb = 1 kg)
• 3 kg / 6 lb 9.7 oz (6.608 lb)

• Source of data
• - - Data from my own collection

• Mentioned in
• -- Original prospect or advert (1981 Quad Products Brochure)

• Literature/Schematics (1)
• - - Manufacturers Literature (Service manual Quad FM4 with updates 1982-1983)

• Literature/Schematics (2)
• - - Manufacturers Literature (Instruction book Quad FM4)

• Author
• Model page created by Stefan Schultze. See "Data change" for further contributors.

• Other Models

• Here you find 38 models, 37 with images and 15 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Quad (Brand); Acoustical Manufacturing Co. Ltd.; Huntingdon