Colorama E-101

• Country
• United States of America (USA)

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

• Year
• 1936

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 42026

• • Brand: Musaphonic

• Picture
• Schematics

Previous Next

Previous Next

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

• Number of Tubes
• 10

• Valves / Tubes
• 6K7 6A8 6J7 6K7 6K7 6H6 6C5 6F5 6L6 5Z4

• Main principle
• Superhet with RF-stage; ZF/IF 465 kHz; 2 AF stage(s)

• Tuned circuits
• 9 AM circuit(s)

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

• Details
• Visual Tuning Indicator pre Eye

• Power type and voltage
• Alternating Current supply (AC) / Either Transformer: 50-60 cycles, 105-120 or 25-60 cycles, 105-120 or 40-60 cycles115; 125; 220; 240 Volt

• Loudspeaker
• Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 8 inch = 20.3 cm

• Power out
• 6.5 W (14 W max.)

• Material
• Wooden case

• from Radiomuseum.org
• Model: Colorama E-101 - General Electric Co. GE;

• Shape
• Tablemodel, Tombstone = decorative upright, not cathedral but can have rounded edges.

• Dimensions (WHD)
• 15.75 x 20.8 x 9.5 inch / 400 x 528 x 241 mm

• Notes

• The General Electric E-101 is an AC operated 10 tube BC, Police and SW band receiver. Has dual speed tuning controls, with fast tuning ratio 8:1 and vernier tuning ratio 40:1. 

  The General Electric models E-101, E-105 and E-106 share the same schematic (Rider's GE 7-29 through 7-32 and GE Service manual 1935-1939 pages 213 to 224) and feature the Colorama tuning indicator (see post 5 etc.). The triode 6C5 commands depending on the AGC line the saturation of the "magnetic amplifier", a saturable core reactor. The reactor is in series with a row of 4 red stained pilot lamps and 3 green stained light bulbs behind the scale which turn the light to green when a carrior (station) is tuned in. Weak stations will produce a small color change and strong stations larger changes - a smooth process. This was then a novelty for GE sets - the Magic Eye was just on the market but GE wanted to first have it's own gadget which was a problem to service men and the cost was over twice that of the tuning eye.
  
  The 6J7 is for the AFC - not used in models E-91 and E-95. The band B (Broadcast) covers 540 - 1680 kc, the band C (Fishery, Police etc.) 1680 - 6000 kc and band D (SW) 6 - 18 mc.

  The E-101 was available with 3 different power transformers:

  Rating Label	Input Voltage (Volts)	Frequency (Cycles)
  A	105-120	50-60
  C	105-120	25-60
  V (Universal transformer)	Taps at 115, 125, 220, 240	40-60

  Note: Stein "Cathedral & Tombstone Radios" lists 4 bands for this model (model actually has 3 bands).

• External source of data
• Ernst Erb

• Source of data
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Circuit diagram reference
• Rider's Perpetual, Volume 7 = 1936 and before

• Mentioned in
• Guide to Old Radios

• Literature/Schematics (1)
• Beitman Radio Diagrams, Vol. 01, 1926-1938 (Page 71)

• Literature/Schematics (2)
• Machine Age to Jet Age II (page 139.)

• Literature/Schematics (3)
• Cathedral & Tombstone Radios (page 119.)

• Literature/Schematics (4)
• General Electric Service Notes (1935-1939, pages 213-224)

• Other Models

• Here you find 2916 models, 2139 with images and 2042 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