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ID = 39131
United States of America (USA)
Brand: Magnavox Co., Commercial Wireless and Development Co.; San Francisco, later Fort Waye, IN
Tube type:  Triode, vacuum   Audio Frequency 
  <1925 very rare. ***
Identical to A_Magnavox
First year 1924 70 Years of Radiotubes and V.

Was used by Radio/TV-reception etc.
Filament If 0.25 Ampere / Direct / Battery =

This gridless triode was developed so as not to infringe with the Lee de Forest patent (owner RCA) on the control grid. Instead, a bar (or bars) fitted behind the filament has influence on the electron flow towards the plate(s).
In later production, the control electrode was a piece of sheet metal with serrating edges to enclose partially the filament.

Text in other languages (may differ)
Tube prices 1 Tube prices (visible for members only)
Information source 70 Years of Radiotubes and V.   
Ballast-Tube Handbook; Jacobi 1985   Suppl.3;Chart #7, for suitable Ballast Amperite 1A
A_Magnavox: Bill Condon collection, with kind permission of Mrs V Condon
Fin Stewart

A_Magnavox: Fin Stewart
Fin Stewart


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