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Sparton 301DC Equasonne

Sparton 301DC Equasonne ; Sparks-Withington Co (ID = 1358570) Radio
 
Sparton 301DC Equasonne ; Sparks-Withington Co (ID = 1358571) Radio
 
Sparton 301DC Equasonne ; Sparks-Withington Co (ID = 1358572) Radio
 
Sparton 301DC Equasonne ; Sparks-Withington Co (ID = 1358573) Radio
 
Sparton 301DC Equasonne ; Sparks-Withington Co (ID = 1369646) Radio
 
Sparton 301DC Equasonne ; Sparks-Withington Co (ID = 1358569) Radio
 
Sparton 301DC Equasonne ; Sparks-Withington Co (ID = 668846) Radio
 
Sparton 301DC Equasonne ; Sparks-Withington Co (ID = 1337764) Radio
Sparton 301DC Equasonne ; Sparks-Withington Co (ID = 1338567) Radio Sparton 301DC Equasonne ; Sparks-Withington Co (ID = 1338644) Radio
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Sparton 301DC Equasonne ; Sparks-Withington Co (ID = 1338567) Radio
Sparks-Withington Co: Sparton 301DC Equasonne [Radio] ID = 1338567 647x1400
Select picture or schematic to display from thumbnails on the right and click for download.
For model Sparton 301DC Equasonne, Sparks-Withington Co., (Sparton); Jackson, Michigan:
By courtesy of member Alan Douglas from his book "Radio Manufacturers of the 1920's", volume 3, page 122.
 
Country:  United States of America (USA)
Manufacturer / Brand:  Sparks-Withington Co., (Sparton); Jackson, Michigan
Year: 1929/1930 perfect model Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 8: 484 484 484 484 484 484 182 182
Main principle TRF without regeneration; 6 AF stage(s)
Tuned circuits 4 AM circuit(s)
Wave bands Broadcast only (MW).
Details
Power type and voltage Direct Current supply (DC) / 115-125 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
Power out
from Radiomuseum.org Model: Sparton 301DC Equasonne - Sparks-Withington Co., Sparton
Material Wooden case
Shape Console with any shape - in general
Notes

The Sparton 301DC Witherington model has one dial (primary tuning control knob) and offers a push-pull audio amplifier. Tubes according to the "Quantity and Types of Tubes" by Sparks-Withington for season 1929/30 would be 6 x  485_Sparton and 2 x 48 but we show tubes 484 and 182 mentioned in the schematic (wrongly called "Sparks Witherington"). Both does not make sense: 182 is a rectifier - this a DC set only and the 48 is from 1932. See the article here about different radio seasons.

 

The Sparton 301DC Witherington model has one dial (primary tuning control knob) and offers a push-pull audio amplifier. Tubes according to the "Quantity and Types of Tubes" by Sparks-Withington for season 1929/30 would be 6 x  485_Sparton and 2 x 483 as model 931DC, but we show tubes 484 and 182 mentioned in the schematic. It does not make sense: 182 is a rectifier - this is a DC set only and 182 must be a special Sparton tube. See the article here about different radio seasons.

In "Radio Retailing" May 1933, page 47, "Tricks of the Trade" we can read for models Sparton 69-A, 79-A, 930AC, 931AC, 931DC, 301DC and 301AC: "Fourth section of band-pass selector, just preceding RF sometimes cannot be tuned to resonance with first three sections, producing weak reception and loss in selectivity. Give first, second and third selector trimmers 3 turns clockwise. This makes slightly less tuning capacity necessary for given frequency and fourth section selector can not be adjusted for resonance. Balance set in customary manner with oscillator and output meter and re-adjust kilocycle scale on dial by loosening it on shaft and re-setting."

Collectors' prices  
External source of data Ernst Erb
Source of data Radio Collector`s Guide 1921-1932
Circuit diagram reference Rider's Perpetual, Volume 2 = 1932 (Models 1931/1932)
Mentioned in The Radio Collector's Directory and Price Guide 1921 - 1965 (Rider's 2-45)
Literature/Schematics (1) Sparton Radio Service Manual (Sparton Manual 1, Bulletin 17-1, 2, Bulletin 6-3, 4)


All listed radios etc. from Sparks-Withington Co., (Sparton); Jackson, Michigan
Here you find 719 models, 340 with images and 646 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.



  
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