|Year: 1928/1929||Type: Broadcast Receiver - or past WW2 Tuner|
|Valves / Tubes||8: C-485 C-485 C-485 C-485 C-485 C-485 50 80|
|Principle||TRF without reaction (non reg.dir.receiver)|
|Tuned circuits||4 AM circuit(s)|
|Wave bands||Broadcast only (MW).|
|Power type and voltage||Alternating Current supply (AC) / 3 taps, 100 to 110, 110 to 120 and 120 to 130 Volt|
|Loudspeaker||Magnetic loudspeaker (reed) generic.|
|from Radiomuseum.org||Model: Sparton 69 Equasonne on Cabinet Speaker 29 - Sparks-Withington Co., Sparton|
|Shape||Console, Lowboy (legs < 50 %).|
Combination of model 69 plus Cabinet Speaker 29
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||199.50 $|
|Mentioned in||Rider's Perpetual, Volume 1 = 1931/1934 (1919 to 1931) (Rider's Sparton 1-7)|
|Literature/Schematics (1)||Radio Manufacturers of the 1920s, Vol 3, Alan Douglas (page 120)|
Model page created by Ernst Erb. See "Data change" for further contributors.
All listed radios etc. from Sparks-Withington Co., (Sparton); Jackson, Michigan
Here you find 653 models, 276 with images and 586 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.