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

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: Datenblatt
Wesselin Tzenow † 25.5.10

348.png 3B7: Telefunken Werkstattbuch
Wolfgang Bauer

More ...

Just Qvigstad
3B7: Sylvania Technical Manual
Peter Hoddow

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Usage in Models 1= 1942 ; 1= 1952

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

Collection of



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