• Country
• United States of America (USA)

• Manufacturer / Brand
• Hallicrafters, The; Chicago, IL and Arlington/Grand Prairie, TX

• Year
• 1938

• Category
• Amateur-Receiver (amateur bands, may include broadcast bands)

• Radiomuseum.org ID
• 18683

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

• Number of Tubes
• 9

• Valves / Tubes
• 6K7 6L7 6J5 6K7 6K7 6Q7 6F6 6J7 80

• Main principle
• Superhet with RF-stage; ZF/IF 465 kHz

• Tuned circuits
• 11 AM circuit(s)

• Wave bands
• Broadcast, Short Wave(s) and Police.

• Power type and voltage
• Alternating Current supply (AC) / 110-120 Volt

• Loudspeaker
• - For headphones or amp.

• Power out
• 3.5 W (unknown quality)

• Material
• Metal case

• from Radiomuseum.org
• Model: Sky Challenger II S-18 - Hallicrafters, The; Chicago,

• Shape
• Tablemodel, low profile (big size).

• Notes
• The Hallicrafters model S18 covers with the following 5 bands from 0.545 to 38.1 mc: 0.545 - 1.23 mc, 1.18 - 2.85 mc, 2.75 - 6.82 mc, 6.75 - 16.40 mc, 15.40 - 38.10 mc (MHz). Recessed Main Dial, Infinite image rejection Circuit on Bands 4 & 5. Socket on rear apron for optional "S" Meter. The 9 tubes are: 6K7 RF Amp; 6L7 as 1st Detector/Mixer; 6J5 Oscillator; 6K7 as 1st IF Amp; 6K7 as 2nd IF Amp; 6Q7 as 2nd Detector / AVC /1st Audio stage; 6F6 Audio Output; 6J7 BFO; 80 Full Wave Rectifier.

• Price in first year of sale
• 77.00 $

• External source of data
• E. Erb 3-907007-36-0

• Source of data
• Communications Receivers

• Circuit diagram reference
• Rider's Perpetual, Volume 13 = 1942 and before

• Other Models

• Here you find 926 models, 476 with images and 526 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hallicrafters, The; Chicago, IL and Arlington/Grand Prairie, TX