Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 58803
United States of America (USA)
Brand: National Union Radio Corp.; Orange (NJ)
Tube type:  Secondary Emission Pentode   VHF 
Identical to 5857
Similar Tubes
Multiple differences or of other kind:
First Source (s)
11.Sep.1950 : Electron Tube Registration List release 904

Base Noval, 9 pin miniature (USA pico-9) B9A
Filament Vf 6.3 Volts / If 0.45 Ampere / Indirect

VHF secondary emission amplifier. Similar, as operating principle and structure of electrodes, to the RCA 1630. The cylindrical focusing electrode directs the two electron beams from opposite directions to a V-shaped dynode, with coated surfaces that release several electrons for each hit. Electrons emitted by the dynode surface are then attracted by the second anode.
Typical operation: 300V anode, 250V inner shield, 210V dynode voltage. Transconductance 20000 umhos.

Information source - - Manufacturers Literature   
5857: Private collection
Emilio Ciardiello

5857: Radio-Electronics 06/1951
Daniel Consales

5857: Manufacturer's Literature
Emilio Ciardiello

from Just Qvigstad

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]