OSRAM ET1 Electrometer triode
Triode pour électromètre
Elecktrometertriode

The ET1 is an electrometer triode specially designed to have a very high input resistance. Typical applications were the measurement of ionization currents, hydrogen-ion concentrations and the study of piezo-electric effects. In order to ensure the very high input resistance required for these applications, the control grid electrode is connected to a terminal mounted at the end of a special high resistance glass stem. Internal and external guard rings and an electrostatic shield round the electrode system are connected to a pin at the base of the valve and may be connected to the negative end of the filament or given any desired negative potential.
(Reference: Keith R Thrower, British Radio Valves. The Classic Years: 1926-1946, Speedwell Books, 2009)

• Filament: 1 V • 0.1 A
• Mutual conductance Va=+4V; Vg1=-2V: 0.05 mA/A
• Mutual conductance Va=+6V; Vg1=-2V: 0.10 mA/A
• Capacitance (Cge): approx. 2 pF

Fiche technique • Data sheet • Datenblatt: ET1.pdf

 

Hauteur • Height • Höhe : 20 cm • 7" 7/8
Diamètre • Diameter • Durchmesser : 38 mm • 1" 1/2

 

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