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Round_Type-N

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ID = 32020
       
Country:
Great Britain (UK)
Brand: Marconi's Wireless Telegraph Co. Ltd.
Tube type:  Gas Triode 
Identical to Round_Type-N
Predecessor Tubes Round_Type-C  

Filament Direct / Battery =
Description

The Type N is a "soft" triode, actually the second early triode in the UK after the Round type C. Type N has an asbestos pellet in a 10 mm tube above the envelope. Quite different to the von Lieben Triode is also the grid, but similar to early Papaleksi tubes. Both, Lieben and Papaleksi use an apendix, but not for Asbestus, but Quicksilver Amalgam. The Round Type N triode was first used in the Marconi Receiver Type 27 from 1914 (or 1915) to 1918.

 
Tube prices 1 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   p209

Usage in Models 1= 1914 ; 1= 1916

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

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