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3B7

Information - Help 
ID = 4297
       
Country:
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Double Triode   VHF 
Identical to 3B7 = 1291 = VT-182 = CV811
Predecessor Tubes 1291  

Base Loctal-8, B8G (Sylvania, 1938) (Codex=Wy)
Was used by Transmittertube (Radio)
Filament Vf 2.8 Volts / If 0.11 Ampere / Direct / Battery =
Description

HF transmitting tube, 5.4W total dissipation. Tipically delivers 2.8W at 25MHz and 1.4W at 125MHz as oscillator. Can be operated with both filament segments in parallel, draining 220mA at 1.4V.
RMA code for Sylvania 1291 developmental type

 
Text in other languages (may differ)
Tube prices 3 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
Taschenbuch zum Röhren-Codex 1948/49   
Röhren-Taschen-Tabelle, (Franzis RTT)
  3b7.png
  3B7: Datenblatt
Wesselin Tzenow † 25.5.10
 
3b7_1291_sylvania.jpg
3B7: My tubes
Anonymous 413 Collector

 
348.png
3B7: Telefunken Werkstattbuch
Wolfgang Bauer

 
3b7_techdat01.png
3B7: Sylvania Technical Manual
Peter Hoddow


from Just Qvigstad

Usage in Models 1= 1942 ; 1= 1952

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):2


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