National FM Multiplex MFB Stereo Amplifier (Motional Feed Back) SA-51H

Panasonic, Matsushita, National ナショナル (also tubes); Osaka

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  • Year
  • 1965 ??
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 321090

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

 Technical Specifications

  • Number of Tubes
  • 18
  • Number of Transistors
  • Main principle
  • Superheterodyne (common); ZF/IF 455/10700 kHz
  • Tuned circuits
  • 6 AM circuit(s)     11 FM circuit(s)
  • Wave bands
  • Broadcast, Short Wave plus FM or UHF.
  • Power type and voltage
  • Alternating Current supply (AC) / 117; 200; 220; 240 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: National FM Multiplex MFB Stereo Amplifier SA-51H - Panasonic, Matsushita,
  • Shape
  • Book-shelf unit.
  • Dimensions (WHD)
  • 470 x 161 x 328 mm / 18.5 x 6.3 x 12.9 inch
  • Notes

  • The National SA-51H amplifier / tuner with Motional Feed Back (MFB) covers three wavebands:

    • MW: 525 - 1605 kHz
    • SW: 3.9 - 12 MHz
    • FM: 88 - 108 MHz

    The MFB speakers with the designation SB-88H have four connections: two for the signal and two for the feedback (MFB coil in front of speaker). A switch at the front regulates the influence of the feedback sensor inside the MFB speakers.

    The SA-51H can also be used with ordinary speakers from 4 to 32 ohms.

    Diodes listed once per type, multiples are:  4 x SD-1A, 2 x OA70, 5 x OA79

    See also National SA-52H with different audio output tubes 4 x 6BQ5.

  • Net weight (2.2 lb = 1 kg)
  • 13.3 kg / 29 lb 4.7 oz (29.295 lb)
  • Source of data
  • -- Schematic
  • Author
  • Model page created by Pedro Marques. See "Data change" for further contributors.

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