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Sparton 931AC Equasonne

Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1358647) Radio
 
Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1358648) Radio
 
Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1358650) Radio
 
Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1358651) Radio
 
Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1369650) Radio
 
Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1369661) Radio
 
Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1369662) Radio
 
Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1358646) Radio
 
Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 631897) Radio
 
Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 631898) Radio
Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 267319) Radio Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 267320) Radio
Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 267321) Radio Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1338662) Radio
Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1338664) Radio Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1357652) Radio
Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1357675) Radio Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1661221) Radio
Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1661223) Radio Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 1661224) Radio
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Sparton 931AC Equasonne ; Sparks-Withington Co (ID = 267319) Radio
Sparks-Withington Co: Sparton 931AC Equasonne [Radio] ID = 267319 640x480
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For model Sparton 931AC Equasonne, Sparks-Withington Co., (Sparton); Jackson, Michigan:
By courtesy of William Kendrick, USA
 
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 9: 485_Sparton 485_Sparton 485_Sparton 485_Sparton 485_Sparton 485_Sparton 482-B 482-B 280
Main principle TRF without regeneration
Tuned circuits 4 AM circuit(s)
Wave bands Broadcast only (MW).
Details
Power type and voltage Alternating Current supply (AC) / 100-130 Volt
Loudspeaker Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
Power out
from Radiomuseum.org Model: Sparton 931AC Equasonne - Sparks-Withington Co., Sparton
Material Wooden case
Shape Console with any shape - in general
Notes

The Sparton 931 (AC) 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 the tubes of model 591: 6 x 485 Sparton, 2 x 482B and 80. We have shown before the tube: 484 484 484 484 484 484 182 182 280 which would make only sense if it is special Sparton tubes. 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."

Price in first year of sale 179.00 $
Collectors' prices  
External source of data Ernst Erb
Source of data Radio Collector`s Guide 1921-1932
Circuit diagram reference Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)
Mentioned in The Radio Collector's Directory and Price Guide 1921 - 1965
Literature/Schematics (1) Radio Manufacturers of the 1920's, Vol. 3 (page 122)
Literature/Schematics (2) Sparton Radio Service Manual (Sparton Manual 1, Bulletin 18-1, 2, Bulletin 6-3, 4)


All listed radios etc. from Sparks-Withington Co., (Sparton); Jackson, Michigan
Here you find 719 models, 339 with images and 646 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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