Mirror-Tone 4B7 12SK7

Meck, John, Industries, Inc.; Plymouth (IN)

Data
Forum
Pictures
Collections

  • Year
  • 1948 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 46912

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

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • TRF with diode detector; 2 AF stage(s)
  • Tuned circuits
  • 2 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • AC/DC-set / 117 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
  • Material
  • Bakelite case
  • from Radiomuseum.org
  • Model: Mirror-Tone 4B7 [12SK7] - Meck, John, Industries, Inc.;
  • Shape
  • Tablemodel without push buttons, Mantel/Midget/Compact up to 14
  • Notes
  • The Jophn Meck models Mirror-Tone 4B7 and 4F8 are very simple TRF without AVC or any feedback or reversed feedback. In Rider's volume 20, copyrighted 1950 we find on Meck page 1 the schematics of EC-720, ED-721 (Chassis 5A9), an other schematic for EV-760 and a third for the two models 4B7 and 4F8.

    This model Mirror-Tone model 4B7 was sold with three different tube line ups: The RF tube is either 12SK7, 12BA6 or 12SG7. The diode detector/AF amp. tube is 12AT6 or 12SQ7, the output tube is 50B5 or 50L6 and the power rectifier is 35W4 or 35Z5. We show the three different model pages for this extremely simple radio.
  • External source of data
  • Ernst Erb

 Collections | Museums | Literature

 Forum