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ID = 81568
Brand: Dario (tubes) - voir aussi La Radiotechnique
Tube type:  Dual-Grid Tetrode 
Identical to RT643_7pin
Similar Tubes
Other base:
Other base and other heater:
First year 1927 Saga of the Vacuum Tube, Tyne pp 404-406

Base SPECIAL TUBEBASE in general
Was used by Radio/TV-reception etc.
Filament Vf 0.6 Volts / If 1.5 Ampere / Direct / Specified voltage AC/DC

This is an early AC tube, dated 1927.


Usage in Models 1= 1927

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

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