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ID = 28807
United States of America (USA)
Brand: DeForest-Tubes
Tube type:  Triode, vacuum   Detector 
Identical to T_deForest
Similar Tubes
Normally replaceable-slightly different:
First year 1912 Saga of the Vacuum Tube, Tyne page 120 ad and 119, 121, 162
First Source (s)
1916 : Saga of the Vacuum Tube, Tyne

Base Wires Wires only.
Was used by Radio/TV-reception etc.
Filament Direct / Battery =
Description tubular audion from 1912, made by McCandless. initially sold only together with Audion (e.g.RJ-4). From April 1916 on also offered separately for sale. 
Information source -- Original prospect or advert   in Tyne Fig.7-11, p.120

T_deForest: own collection
Peter den Boer

More ...
Usage in Models 1= 1912 ; 1= 1914 ; 1= 1916?? ; 2= 1916 ; 3= 1917 ; 3= 1919 ; 2= 1920 ; 1= 1921

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):14

Collection of

Collection of a member from D


Forum contributions about this tube
Threads: 1 | Posts: 1
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Directions for using the Type "T" Tubular Audion Bulb
Alan Larsen

From the 1916 Manhattan Electrical Supply catalog. 

End of forum contributions about this tube

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