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Sparton 4940TV

Sparton 4940TV ; Sparks-Withington Co (ID = 1301643) Television
 
Sparton 4940TV ; Sparks-Withington Co (ID = 1301644) Television
 
Sparton 4940TV ; Sparks-Withington Co (ID = 1301645) Television
 
Sparton 4940TV ; Sparks-Withington Co (ID = 1283773) Television
 
Sparton 4940TV ; Sparks-Withington Co (ID = 1285416) Television
 
Sparton 4940TV ; Sparks-Withington Co (ID = 1285418) Television
 
Sparton 4940TV ; Sparks-Withington Co (ID = 1285419) Television
 
Sparton 4940TV ; Sparks-Withington Co (ID = 1285420) Television
 
Sparton 4940TV ; Sparks-Withington Co (ID = 1285421) Television
 
Sparton 4940TV ; Sparks-Withington Co (ID = 1285423) Television
Sparton 4940TV ; Sparks-Withington Co (ID = 1283769) Television  
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Sparton 4940TV ; Sparks-Withington Co (ID = 1283769) Television
Sparks-Withington Co: Sparton 4940TV [Television] ID = 1283769 933x917
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For model Sparton 4940TV, Sparks-Withington Co., (Sparton); Jackson, Michigan:
SAMS Photofact Folder 4912-11 6/49
 
Country:  United States of America (USA)
Manufacturer / Brand:  Sparks-Withington Co., (Sparton); Jackson, Michigan
Year: 1949 Type: Television Receiver (TV) or Monitor
Valves / Tubes 37: 6BH6 6AG5 6C4 6BH6 6BH6 6BH6 6BH6 6AL5 6AU6 6AK6 6AL5 6AU6 6AU6 6AU6 6AL5 6AT6 6V6 6J6 6SN7 6V6 6AL5 12AU7 6L6 5V4 6SN7 1B3 5U4 6BA6 6BE6 7A7 7AG7 7AG7 7AG7 6AL5 7B6 7B5 5Y3 10BP4
Principle Super-Heterodyne (Super in general)
Wave bands Wave Bands given in the notes.
Details
Power type and voltage Alternating Current supply (AC) / 117 Volt
Loudspeaker 2 Loudspeakers / Ø 9.5 inch = 24.1 cm
Power out
from Radiomuseum.org Model: Sparton 4940TV - Sparks-Withington Co., Sparton
Material Wooden case
Shape Console with any shape - in general
Dimensions (WHD) 26 x 32 x 15 inch / 660 x 813 x 381 mm
Notes 10 " mirror-in-lid b/w TV with US standard VHF tuner, mahogany. Channels 2 through 13
Source of data Photofact Folder, Howard W. SAMS
Mentioned in Volume 7 Set #64 Folder 4912-11 06/1949

Model page created by a member from A. See "Data change" for further contributors.



All listed radios etc. from Sparks-Withington Co., (Sparton); Jackson, Michigan
Here you find 654 models, 283 with images and 586 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


 


Forum contributions about this model
Sparks-Withington Co: Sparton 4940TV
Threads: 1 | Posts: 2
Hits: 271     Replies: 1
sparks-wit: Sparton 4940TV
Gregory Jones
09.Jul.15
  1
I have this model set and it did operate when I bought it 30 some odd years ago but had a very dim picture. The neat thing about this TV was that the displayed picture was a reverse image so it looked normal when viewed through the mirror in the lid. Anyhow, I finally replaced all the paper and electrolytic capacitors and now there is no raster. I suspect problem is in the high frequency H.V. Power supply. It consists of a 6SN7 hooked up for parallel operation of a oscillator tuned to about 300khz feeding into primary of the high voltage transformer which has a secondary consisting of multiple separated windings to minimize corona discharge. The power supply appears to be operating correctly but the resistance reading of the secondary is about 560 ohms and that seemed a little high. Does anyone know much about these long forgotten H.V. Power supplies used in early TV or have any info about this particular set? Any insight would be appreciated. 
 
Thomas Albrecht
10.Jul.15
  2

Gregory,

Many early TVs used this type of RF high voltage supply.  While the resistance of the secondary sounds higher than most, it is most likely OK (and hard to see what type of failure would lead to a resistance in this range).  I'd start by checking the voltages on the 6SN7 HV oscillator and seeing whether anything is amiss there.  Check the voltages against the table provided in the Sams service literature you can download from the model page.

Tom

 
Sparks-Withington Co: Sparton 4940TV
End of forum contributions about this model

  
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