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Sparton 79-A Equasonne

Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 1356787) Radio
 
Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 1356788) Radio
 
Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 1356789) Radio
 
Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 1356786) Radio
 
Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 666855) Radio
 
Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 1337760) Radio
Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 269836) Radio Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 269835) Radio
Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 269832) Radio Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 269830) Radio
Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 269831) Radio Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 269833) Radio
Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 269834) Radio Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 1338672) Radio
Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 1338673) Radio Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 1357649) Radio
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Sparton 79-A Equasonne ; Sparks-Withington Co (ID = 269836) Radio
Sparks-Withington Co: Sparton 79-A Equasonne [Radio] ID = 269836 519x680
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For model Sparton 79-A Equasonne, Sparks-Withington Co., (Sparton); Jackson, Michigan:
Ebay Nr. 280045016539 Bild bearbeitet.
 
Country:  United States of America (USA)
Manufacturer / Brand:  Sparks-Withington Co., (Sparton); Jackson, Michigan
Year: 1928/1929 perfect model Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 8: C-485 C-485 C-485 C-485 C-485 C-485 50 80
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) / 110-130 Volt
Loudspeaker - For headphones or amp.
Power out
from Radiomuseum.org Model: Sparton 79-A Equasonne - Sparks-Withington Co., Sparton
Material Wooden case
Shape Console with any shape - in general
Notes

The Sparton 69 and 69-A have one dial (primary tuning control knob). These models share the same schematic: 69, 79-A and 89 without naming the tubes and we think that 69-A is existing too because it is named below (in Radio Retailing). The list "Quantity and Types of tubes" from Sparks-Withington shows us for model 69: 6 x 485 Sparton, 50 and 80 but that is already the replacement!
The models 39, 69, 79-A, 89, 89-A, 99, 109 and 930 are the first "Equasonne" models. The tubes are the original line up, not replacement, according to the page "The quantity and types of tubes used in Sparton receiving sets" and of Rider's page Sparton 5-6, replacement for the C-485, C-484 or 484 would be the 485_Sparton. See also 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."

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 Radio Manufacturers of the 1920's, Vol. 3 (Rider's 1-7)
Literature/Schematics (1) Sparton Radio Service Manual (Sparton Manual 1, Bulletin 7-1, 2, Bulletin 6-3)


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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