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ID = 37070
Tube type:  Glow Indicator (Neon)   Indication 
Identical to Flash-O-Graph
Similar Tubes
Multiple differences or of other kind:
  Tonebeam ; Tune-A-Lite

Filament --/--
Description The "Flas-O-Graph" is a Neon Indicator tube with two electodes which was replacing the "Shadowgraph" (Philco) type, the bulbs (with a special transformer) or meters for tuning correctly. The Flash-O-Graph is employed e.g. in Fada consoles in the early 1930's. The principle of neon indicators has been made also with 3 electrodes and a 4 electrode neon indicator allowed even "Silent Tuning".

See also other kind of indicators for early superhets like the Tune-A-Lite (Atwater Kent) from the inventor/manufacturer Duovac. Other radiomanufacturers had their own name for the neon indicator like this "Flash-O-Graph". Examples: Tonebeam (Atwater Kent 96-F), Tuneon (Philips), "Tuning Flasher" (Sears) or other principles like Viso-Glo, the VG-1 for Sparks Withington (Sparton) before the Magic-Eye. 

Flash-O-Graph: Advertisement September 1931
Ernst Erb

Usage in Models 3= 1931? ; 11= 1932 ; 1= 1933?? ; 3= 1933? ; 3= 1933

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):21

Collection of



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