radiomuseum.org
Please click your language flag. Bitte Sprachflagge klicken.

407A

Information - Help 
ID = 5812
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Double Triode 
Identical to 407A
Similar Tubes
Different maximum ratings:
  407B
Multiple differences or of other kind:
  2C51 ; 396A ; 5670 ; TR1005
First Source (s)
15.Dec.1947 : -- Collector info (Sammler)
Base Noval, 9 pin miniature (USA pico-9) B9A (Codex=Eo)
Was used by Telephony
Filament Vf 40 Volts / If 0.05 Ampere / Indirect / Specified voltage AND current AC/DC
Description

Miniature twin triode, designed for use in carrier repeater equipment 9-B & #-2 telegraph boards.
Having heaters and plate series supplied through cable pairs. Heater can be connected for 20V, 100mA operation.
GE, RCA, Sylvania, WE known suppliers.

 
Text in other languages (may differ)
Tube prices 1 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Tube Lore (I)   
407a_sock.png 407A: Sylvania Data Sheet
Egon Penker

Just Qvigstad 		407a_dat.png
407A: Sylvana Data Sheet
Egon Penker
More ...

Collection of

Egon Penker (A)
Stig Comstedt (S)
Documents about this component
  One fascinating application of the 407A as bidirectional line amplifier is given in this article from Electronics, January 1955. The circuit operates, with reduced gain, even in case of a tube failure. 1887 KB
 
407a.jpg

407A
 
You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]
  
Data Compliance More Information