• Country
• United States of America (USA)

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

• Year
• 1970 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 268586

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

• Number of Tubes
• 1

• Valves / Tubes
• D3-11GJ

• Number of Transistors
• 40

• Semiconductors

• Main principle
• Superhet with RF-stage; ZF/IF 10700 kHz

• Tuned circuits
• 19 FM circuit(s)

• Wave bands
• FM Broadcast Band Only

• Power type and voltage
• Alternating Current supply (AC) / 50 to 60 cycles, 120; 240 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Stereophonic Tuner twenty 20B - Marantz Sound United LLC;

• Shape
• Book-shelf unit.

• Dimensions (WHD)
• 390 x 146 x 365 mm / 15.4 x 5.7 x 14.4 inch

• Notes

• Oscilloscope indicator for tuning, field strength, multipath, internal or external audio.
  Front-End with dual-gate MOSFET RF-preamplifier, FET-mixer.
  30 bipolar transistors + 10 FET.

  Predecessor: Marantz Stereophonic Tuner twenty.

• Net weight (2.2 lb = 1 kg)
• 13 kg / 28 lb 10.1 oz (28.634 lb)

• Price in first year of sale
• 3,950.00 DM

• Mentioned in
• -- Original-techn. papers.

• Literature/Schematics (1)
• HiFi-Jahrbuch 6, Nr. 383, Verlag G. Braun, 1972

• Literature/Schematics (2)
• HiFi Stereophonie Test Jahrbuch 1972

• Author
• Model page created by Bernhard Nagel. See "Data change" for further contributors.

• Other Models

• Here you find 569 models, 560 with images and 91 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Marantz (Sound United LLC); Vista, CA