- Ceramiczna podstawa
- 4 pozłacane piny
- oksydowane filamenty
- płytki triody z siatki
Classification#
Dome-type or Aubergine-type bulb of glass, a white ceramic base with four-prong bayonet golden pins, oxide coated filamentary, mesh plate or carbon plate triode.
Application#
Audio frequency amplifier where power outputs of approximately 3.5 watts or less is required at relatively low plate voltages.
Dimensions#
Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures below.
Nominal operating conditions and parameters#
Filament voltage* …………………………………………………………… 2.5V
Nominal filament current …………………………………………………… 2.5A
Plate voltage ………………………………………………………………… 250V
Grid voltage** ……………………………………………………………… -45V
Plate current ………………………………………………………………… 60mA
Plate current ………………………………………………………………… 62.5mA
Amplification factor …………………………………………………………… 4.2
Grid to plate transconductance …………………………………………… 5.25mA / V
Grid Current ………………………………………………………………… 0.05 μA
Plate resistance …………………………………………………… ………800 ohms
Load resistance …………………………………………………………… 2.5kohms
*Alternating-current filament supply or Direct-current filament supply.
**Alternating-current filament supply is used. The grid and plate returns should be connected to a center tap on the secondary of the filament transformer.
Direct-current filament supply is used. The grid and platter returns are connected to the negative end of the filament.
Characteristics-Average characteristics#
Below shown typical curves of plate currents of grid voltage for several values of plate voltages. It is alternating-current filament supply.
Limiting Operation Conditions for Safe Nor simultaneous ratings#
Maximum plate voltage …………………………………………………… 300 volts
Maximum plate dissipation …………………………………………………… 15 watts