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ID = 81571
Brand: Dario (tubes) - voir aussi La Radiotechnique
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 rare.
Identical to RT656_6pin
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.

Information source - - Manufacturers Literature   not dated

f_dario_rt656_sockel_6pin.png RT656_6pin: Dépliant Dario
Mark Hippenstiel

Usage in Models 1= 1927

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

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