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ID = 19378
Brand: AEG (Radios) Allg.Elektricitäts-Ges.
Tube type:  Triode, vacuum 
  <1925 rare.
Identical to K1
Similar Tubes
Normally replaceable-slightly different:
Differences not known by us:

Base Blade contact
Filament Vf 2.2 Volts / If 0.52 Ampere / Direct / Battery =

Anode = 90 Volt. In serie with the filament is a “Iron in hydrogen current limitter” of 0.52 Amp and connected to a 6 Volt filament accumulator. This current limitter and the resistance of the filament (law of Ohm) will reduce the real filament voltage to about 2.2 Volt. See also K1-AEG.pdf.

The Siemens A tube looks very similar to the AEG K1 but has a rectangular grid and later a tightly stretched  filament. They had a patent on it. Benefit was an even emission across the whole filament. In the AEG K1 the emission has a maximum at the top of the filament and thus it burned at this spot in most cases after several hours of use. Siemens also  used a punched grid whereas AEG grids are made from a spiral.

In WW1 AEG, Siemens and Telefunken had own tube production sites more looking like workshops. Later these sites have been consolidated and OSRAM built a lot of tubes for the mothercompanies.

Tube prices 5 Tube prices (visible for members only)
K1: Sammlung EE
Ernst Erb

K1: Nesper, Handbuch der drahtlosen Telegraphie (1921)
Nikolaus Löwe

Usage in Models 1= 1916?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

Documents about this component
  Articles about the K1 in German and english. 2281 KB

Forum contributions about this tube
Threads: 1 | Posts: 2
Hits: 2003     Replies: 1
K1 (K1)
Wolfgang Thiel
  1 Hi all
I just was able to buy an AEG tube type K1 from 1918 for my collection. Information on this tube is very sparse. On the existing tag it states the operating current as 0.52 A and the production year as 1918. Has someone in the forum any more details ( filament voltage, typical use) ? Any input would be much appreciated.Thanks
Hans-Thomas Schmidt
  2 Hello Wolfgang,

the K1 was used in the First World War for audio telephony amplification. You can find a lot of informations on this and other early tubes in the "tube bible" from Gerald F. J. Tyne: Saga of the vacuum tube (in english language).

Saga of the vacuum tube

Best regards from bavaria,  Hans-Thomas
End of forum contributions about this tube

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