• Country
• United States of America (USA)

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

• Year
• 1930 ?

• Category
• Pre-stage (adaptor for SW/FM/VHF/UHF incl. built-in), Frequency converter

• Radiomuseum.org ID
• 36943

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

• Number of Tubes
• 4

• Valves / Tubes
• UY224 UY227 UY224 UX280

• Main principle
• Superheterodyne (common)

• Wave bands
• Short Wave (SW only)

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

• Loudspeaker
• - - No sound reproduction output.

• Material
• Wooden case

• from Radiomuseum.org
• Model: Converter 7 - Crosley Radio Corp.;

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

• Dimensions (WHD)
• 300 x 245 x 220 mm / 11.8 x 9.6 x 8.7 inch

• Notes
• The Rider's schematic Crosley 2-1 shares the same schematic for the converters model 7 and model 7-1. The model 7 is a set for attaching to any broadcast receiver in order to adapt the latter to the reception of short-wave signals. The incoming signal is being converted to a frequency within the regular broadcast range by the use of an oscillator and detector. After conversion to the appropriate frequency the signal is delivered to the aerial and ground terminals of the broadcast receiver. The first stage is an untuned buffer amplifier UY224, followed by the tuned oscillator UY227 and the tuned detector UY224. The model 7-1 is similar but with one tube less and a tuned antenna circuit. It has a UY224 as first detector, a UY227 oscillator and a UX280 rectifier. Rider's Crosley 2-2 shows details about the model 7-1 voltage and shows the details for the model 7-2 converter. The "Converter 7-2" is a short wave adapter without a power pack. It obtains its power from the croadcast receiver. Instead of plug-in frequency change coils, it is equipped with a coil changing switch. There are five switch positions, four of which are for short-wave reception, and the fifth for operating the ordinary broadcast receiver. It has a YU227 oscillator and a UY224 detector only. It operates with a set with a pentode output tube which will be used with an adapter for the power cable plug.

• Net weight (2.2 lb = 1 kg)
• 6.750 kg / 14 lb 13.9 oz (14.868 lb)

• External source of data
• Ernst Erb

• Circuit diagram reference
• Rider's Perpetual, Volume 2 = 1932 (Models 1931/1932)

• Other Models

• Here you find 1773 models, 1042 with images and 1257 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Crosley Radio Corp.; Cincinnati (OH)