• Country
• United States of America (USA)

• Manufacturer / Brand
• Crosley Radio Corp.; Cincinnati (OH)

• Year
• 1922

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 36641

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

• Number of Tubes
• 2

• Valves / Tubes
• UV201 UV201

• Main principle
• Audio-Amplification; 2 AF stage(s)

• Wave bands
• - without

• Power type and voltage
• Storage and/or dry batteries / Storage Battery 6 & dry 45 Volt

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: Two-Step Amplifier or 2-stage Audio Amp. [first version: front switch] - Crosley Radio Corp.;

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

• Dimensions (WHD)
• 11.5 x 6 x 4.875 inch / 292 x 152 x 124 mm

• Notes
• This is the early version of the "Two Step Amplifier" as it was officially called in ads. It is sometimes named 2-stage audio amplifier (or Amp.). In the middle of the two knobs for the two stations, there is a front panel switch to select one or two stages of amplification. Box has overhanging lid. There are at least three different versions regarding engraving: First version February 1922 with market introduction: straight without special logo: "Crosley two step amplifier" in one line. Second version May 1922 - engraving in two lines. Third version: Later or on the same time it was available without any engraving for the name. In 1923 it was not anymore on the market.
  
  Here is a link to some sources for this model.
  Later models have no such switch on the front and are a bit cheaper. The lid is integrated and without overhang. Those later models could be bought with or without engraving "Crosley Cincinnati TWO STEP AMPLIFIER" (including the logo) - with a price difference of one $.
  
  The first catalog, early 1922, tells us that the two-step Amplifier can also be bought unmounted for $ 22.50 instead of $ 25 - and that the "amplifier cabinet is designed to match up uniformly with either the CROSLEY Detector Unit, the HARKO JUNIOR or the HARKO SENIOR."

• Price in first year of sale
• 25.00 $ +

• External source of data
• Ernst Erb

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

• Mentioned in
• Radio Manufacturers of the 1920s, Vol 1 (pp.113, 115)

• Literature/Schematics (1)
• Radio Broadcast, May 1922, page 81

• Literature/Schematics (4)
• Radio News (February 1922, page 725.)

• Other Models

• Here you find 1791 models, 1048 with images and 1282 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Crosley Radio Corp.; Cincinnati (OH)