• Country
• United States of America (USA)

• Manufacturer / Brand
• Globe Electric Co.; Milwaukee, Wisconsin (Duodyne)

• Year
• 1925

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 43132

• Number of Tubes
• 4

• Valves / Tubes
• UV201A UV201A UV201A UV201A

• Main principle
• TRF (Tuned-Radio-Frequency but use of regeneration unknown); 2 AF stage(s)

• Tuned circuits
• 2 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage and/or dry batteries

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: DuoDyne 770 [arrow on outer knobs] - Globe Electric Co.; Milwaukee,

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

• Dimensions (WHD)
• 503 x 186 x 205 mm / 19.8 x 7.3 x 8.1 inch

• Notes
• The Globe model DuoDyne 770 has two primary tuning control knobs plus 4 additional knobs and two Jack sockets. An original add shows only one Jack socket. See also the other variants of model 770 - with and without the name DuoDyne - and with either upper row with 5 knobs, missing the left knob on the lower part - or having two small knobs on each, the lower and the upper row. We try to find out the different variants and then to put them into the right time sequence. See for instance the numbers on the two small knobs on the upper row - on one of the variants.Be careful to which variant of the 770 you load photos. Tell us please by placing a forum article to the model if you found an other variant we don't display yet - and we will split the model then.
  This variant has 4 kobs on the upper row (not 5) and only one below in the middle. As also the adds show, no characters engraved on the outer (small) knobs. It shows a plate in the center. The add shows only one Jack socket but are there existing models with only one Jack socket and are different knob forms original or not?

• Price in first year of sale
• 55.00 $

• External source of data
• Ernst Erb

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

• Mentioned in
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Other Models

• Here you find 34 models, 20 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Globe Electric Co.; Milwaukee, Wisconsin (Duodyne)