Acmeflex Model A

• Country
• United States of America (USA)

• Manufacturer / Brand
• Acme Apparatus Co.; Cambridge (MA)

• Year
• 1925 ?

• Category
• Kit (Parts plus instruction) or building instructions only

• Radiomuseum.org ID
• 336932

• Picture
• Schematics

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

• Number of Tubes
• 4

• Valves / Tubes
• 01A 01A 01A 01A

• Main principle
• Special principle (see notes); 3 AF stage(s); Reflex

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage and/or dry batteries / 90; 6; 4.5 Volt

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: Acmeflex Model A - Acme Apparatus Co.; Cambridge

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Notes

• Radio is unique because of its reflex design, single tuned stage, and panel-mounted crystal detector. The radio must be connected to a loop antenna to complete the tuned circuit. Selectivity is poor, but would have been adequate in 1925. If a tuned loop is used, the radio can be tuned across most of the AM band with much better selectivity.  Rheostat controls filaments of all 4 tubes.  Potentiometer controls bias on first tube grid.  Acme put the rheostat and pot in a concentric arrangement.  The crystal detector has a coarse adjustment and a small vernier to help move the internal cat whisker.  This detector works very well and once set it requires very little attention. It was in a cheaply made pine box with a plain bakelite front panel.  It was intended to be low cost compared to other radios at that time, but still provides adequate sensitivity and enough power to clearly drive a horn or loudspeaker of that time.

  Everything in the Kit except tubes, batteries and speaker.

• Source of data
• Radio Collector`s Guide 1921-1932

• Literature/Schematics (1)
• -- Schematic

• Author
• Model page created by Tim McVey. See "Data change" for further contributors.

• Other Models

• Here you find 21 models, 20 with images and 5 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Acme Apparatus Co.; Cambridge (MA)