• Country
• United States of America (USA)

• Manufacturer / Brand
• Marantz (Sound United LLC); Vista, CA

• Year
• 1972–1975

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 108917

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

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Superheterodyne (common); ZF/IF 455/10700 kHz

• Wave bands
• Broadcast (BC) and FM or UHF.

• Details
• Hi-Fi equipment

• Power type and voltage
• Alternating Current supply (AC) / 110; 120; 220; 240 Volt

• Loudspeaker
• - This model requires external speaker(s).

• Power out
• 140 W (210 W max.)

• Material
• Metal case

• from Radiomuseum.org
• Model: Stereophonic Receiver 2270 - Marantz Sound United LLC;

• Shape
• Book-shelf unit.

• Dimensions (WHD)
• 17.328 x 5.39 x 14 inch / 440 x 137 x 356 mm

• Notes

• A hi-fi stereo receiver with an AM/FM stereo tuner with analogue dial and an integrated amplifier with power output of 2 x 70 watts RMS into 8 ohms, housed in a metal cabinet (a WC-22 walnut cabinet optional). The preamplifier and power amplifier sections can be separated.  With Signal Strength and FM Tuning meters, jacks for headphones and Dubbing, Gyro Touch tuning, Bass, Mid and treble tone controls, Hi Blend, Low & Hi Filters, Loudness, Mono, Muting, Main & Remote Speakers. On the back, an AM ferrite rod antenna, AM and FM antennae terminals, RCA phono sockets for input phono1 and 2 (MM) and Aux, for input/output for 2 Tapes, for FM Quadradial output, Main In/Pre Out, terminals for 2 pairs of loudspeakers, switched and unswitched AC outlets.

  Specification
  Audio Section
  Rated continuous (RMS) power output per channel, both channels driven
  Into 4Ω and 8Ω  Into 16Ω	70 W 40 W
  Comparable Total Music Power (IHF)	210 W into 8Ω
  Dynamic range	96dB
  IM Distortion (SMPTE), at rated power	0.3%
  Total Harmonic Distortion, at rated power	0.3% Max.
  Power Bandwidth (IHF) for 0.3% THD	7Hz-50kHz
  Damping Factor (ref. 8Ω)	> 45
  Frequency Response through phono	±1dB
  Input Sensitivity (for 40W at 8Ω)
  High-level  Phono (1kHz)	180mV 1.8mV
  Input Impedance
  High-level  Phono	100kΩ 47kΩ
  Channel Separation 20Hz-20kHz	35dB Min.
  FM Section
  IHF Usable Sensitivity	2.3µV
  Selectivity	80dB
  Total Harmonic Distortion, 400Hz, 100% Mod.	0.2% (Mono), 0.4% (Stereo)
  Frequency Response	50Hz-15kHz ±1dB
  Stereo Separation 1kHz	40dB
  AM Section
  IHF Sensitivity	25µV

  Versions/Power requirements
  110/120/220/240V AC 50/60Hz switchable internally

  Power consumption: 500 W

  Das Spitzenmodell der für das Modelljahr 1972 vorgestellten 22xx Serie. Dieses Gerät wurde mit kleinen Änderungen bis 1975 gebaut. Es gab gravierte oder bedruckte, alu- oder champagnerfarbene ("gold-anodized") Frontblenden. Die Ausgangsleistung des 2270 wurde vom Hersteller, sehr konservativ, mit 2 x 70 Watt Dauerleistung bzw 2 x 105 Watt Musikleistung, nach RMS (20-20.000Hz) an 8 Ohm angegeben. Ein zeitgenössischer Test der HiFi Stereofonie vom Juli 1973 ergab eine Dauerleistung von  2 x 90 Watt an 8 Ohm. An 4 Ohm wurden, mit einem Klirrfaktor von unter 1%, 2 x 140 Watt gemessen.

  3-fache, kanalgetrennte, Klangregelung, Vor und Endstufe auftrennbar, Mittenanzeige, Feldstärkeanzeige umschaltbar als Reflexionsanzeige ("Multipath") zur Einstellung einer motorbetriebenen Außenantenne. Leistungsaufnahme 500 Watt.

  Designed in USA, Produced in Japan

• Net weight (2.2 lb = 1 kg)
• 38.5 lb (38 lb 8 oz) / 17.479 kg

• Price in first year of sale
• 2,895.00 DM

• Mentioned in
• -- Original prospect or advert (HiFi Jahrbuch 7 (1972), Bedienungsanleitung)

• Literature/Schematics (1)
• -- Original prospect or advert (1972 Marantz Stereo Receivers catalogue)

• Literature/Schematics (2)
• - - Manufacturers Literature (Service manual Marantz 2270)

• Literature/Schematics (3)
• - - Manufacturers Literature (Handbook of Instructions Marantz 2270)

• Author
• Model page created by Ralf Kläs. See "Data change" for further contributors.

• Other Models

• Here you find 569 models, 560 with images and 92 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Marantz (Sound United LLC); Vista, CA