• Country
• United States of America (USA)

• Manufacturer / Brand
• General Electric Co. (GE); Bridgeport CT, Syracuse NY

• Year
• 1939 ?

• Category
• Power supply/conditioner or battery or charger 

• Radiomuseum.org ID
• 369639

• • Brand: Musaphonic

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

• Wave bands
• - without

• Power type and voltage
• Powered by external power supply or a main unit. / 24 - 28 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Dynamotor Unit PE-73- - General Electric Co. GE;

• Shape
• Chassis only or for «building in»

• Dimensions (WHD)
• 190.5 x 265.9 x 280.99 mm / 7.5 x 10.5 x 11.1 inch

• Notes

• PE-73 / PE-73-C Dynamotor Unit

  The PE-73 (and its variant PE-73-C) is a heavy-duty dynamotor (rotary converter) manufactured primarily by General Electric during World War II. It was designed specifically to supply high-voltage DC power to the BC-375-E radio transmitter (part of the SCR-287 aircraft radio set).

  Main function: Converts the aircraft’s standard 24/28 V DC battery voltage into approximately 1000 V DC at up to 350 mA for the transmitter’s plate circuits. It consists of a single-shaft motor-generator unit (low-voltage motor + high-voltage generator), mounted together with a relay-fuse box containing a starting relay, fuses (low- and high-voltage), capacitors, and connection sockets (SO-39 and SO-41).

  Technical Data:

  • Input: 24–28 V DC (nominal 26–28 V recommended)
  • Input current: 20–30 A (depending on load; includes starting surge)
  • Output: approx. 1025-1050 V DC at 350 mA (at 24 V input)
  • Mounting: FT-107

  The PE-73 runs continuously while the transmitter is in standby (high voltage is present even when not keyed). It was used on many US Army Air Forces bombers and medium aircraft such as the B-17 Flying Fortress, B-24 Liberator, B-25, etc.

• Net weight (2.2 lb = 1 kg)
• 16.9 kg / 37 lb 3.6 oz (37.225 lb)

• Mentioned in
• -- Original-techn. papers. (Army Air Force Technical Order No. 08-10-139, 1943)

• Author
• Model page created by Jesus Fernandez Gamito. See "Data change" for further contributors.

• Other Models

• Here you find 2969 models, 2185 with images and 2081 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from General Electric Co. (GE); Bridgeport CT, Syracuse NY