• Country
• United States of America (USA)

• Manufacturer / Brand
• Sparks-Withington Co., (Sparton); Jackson, Michigan

• Year
• 1934/1935

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 58519

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 14

• Valves / Tubes
• 58 2A7 56 58 VG-1 58 56 56 56 2A5 2A5 2A5 2A5 5Z3

• Main principle
• Superhet with RF-stage; ZF/IF 456 kHz; 2 AF stage(s)

• Tuned circuits
• 9 AM circuit(s)

• Wave bands
• Broadcast plus more than 2 Short Wave bands.

• Power type and voltage
• Alternating Current supply (AC) / 115 Volt

• Loudspeaker
• 3 Loudspeakers

• Material
• Wooden case

• from Radiomuseum.org
• Model: Sparton Triolian 136 Ch= 46A - Sparks-Withington Co., Sparton

• Shape
• Console with any shape - in general

• Dimensions (WHD)
• 28 x 39.5 x 13 inch / 711 x 1003 x 330 mm

• Notes

• The Sparton models Triolian use three electrodynamic speakers. This model 136 has a push-pull audio amplifier using 2 x 2 type 2A5 tubes in parallel. The center speaker measures 12" in diameter, the two others 8". The models 134 and 136 share the same Rider's schematic and have 5 tuning bands with a range from 540 kHz up to 24 MHz. The bands change in color of background light to each separate band as bandswitch is changed. The 136 has a more modern cabinet than the 134 both are then "the top of the line".
  The VisoGlo tuning indicator VG-1 is extremely rare, even in the literature it is nearly not noticed. See the article here about season 1934/35.

• External source of data
• Ernst Erb

• Source of data
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Circuit diagram reference
• Rider's Perpetual, Volume 6 = 1935 and before

• Mentioned in
• Rider's 6-5, 6-6

• Other Models

• Here you find 773 models, 361 with images and 720 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sparks-Withington Co., (Sparton); Jackson, Michigan