Classification- It is a nine golden pins tube. Oxide coated cathode of indirect heated. It is a Twin triode.

Application -It intended for use a NF voltage amplifier or Phase inuerter. It is Low noise tube.

Dimensions -Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1, and 2.

Fig 1                                                                                               Fig 2

Nominal operating conditions and parameters
Heater voltage ……………………………………………………………… 12.6V
Heater current ……………………………………………………………… 0.15A
Plate voltage ………………………………………………………………… 250V
Grid voltage ………………………………………………………………… -2V
Plate resistance …………………………………………………………… 62.5kohms
Plate current ………………………………………………………………… 1.2mA
Amplification factor …………………………………………………………… 100

Characteristics-Average characteristics
Figure 3. shown typical curves of plate currents of grid voltage for several values of plate voltages. It is alternating-current filament supply.

Fig 3

Limiting Operation Conditions for Safe Nor simultaneous ratings
Maximum plate voltage …………………………………………………………… 300 V
Maximum negative Grid voltage ………………………………………………… -50V
Maximum positive Grid voltage …………………………………………………… 0V
Maximum Power of plate ………………………………………………………… 1.0W

Classification- It is a Twin triode. It is a nine golden pins tube. Oxide coated of indirect heated.

Application -It intended for use a voltage amplifier or Phase inuerter.

Dimensions -Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1, and 2.

Fig 1                                                                                  Fig 2

Nominal operating conditions and parameters
Heater voltage ……………………………………………………………… 12.6V
Heater current ……………………………………………………………… 0.15A
Plate voltage ………………………………………………………………… 250V
Grid voltage ………………………………………………………………… -8.5V
Plater resistance …………………………………………………………… 7.7kohms
Plate current ………………………………………………………………… 10.5mA
Amplification factor …………………………………………………………… 17

Characteristics-Average characteristics
Figure 3. shown typical curves of plate currents of grid voltage for several values of plate voltages. It is alternating-current filament supply.

Fig 3

Limiting Operation Conditions for Safe Nor simultaneous ratings
Maximum plate voltage ………………………………………………… 300V
Maximum Grid voltage ………………………………………………… -50V
Maximum Grid voltage ………………………………………………… 0V
Maximum Power of plate ……………………………………………… 1.0W

Classification- Globe-type bulb of glass, a white ceramic base with four-prong bayonet golden pins, oxide coated filamentary, solid plate or mesh plate triolde.

Application -It intended for use as a audio frequency voltage amplifier.

Dimensions -Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1and 2.

Nominal operating conditions and parameters
Filament voltage* ……………………………………………………………… 2.1V
Nominal filament current …………………………………………………… 1.0A
Plate voltage ………………………………………………………………… 160V
Grid voltage ………………………………………………………………… -3V
Plate resistance ………………………………………………………… 8.1kohms
Plate current ……………………………………………………………… 0.34mA
Amplification factor ………………………………………………………… 29.2

*Direct-current filament supply is used. The grid and platter returns are connected to the negative end of the filament.

Characteristics-Average characteristics
Figure 3. shown typical curves of plate currents of grid voltage for several values of plate voltages. It is alternating-current filament supply.

Fig 3

Limiting Operation Conditions for Safe Nor simultaneous ratings
Maximum plate voltage …………………………………………………… 190 volts
Maximum plate current …………………………………………………… 1.5mA

Classification- Globe-type bulb of glass, a white ceramic base with four-prong bayonet golden pins, oxide coated filamentary, solid plate or mesh plate triolde.

Application -Voice frequency and carrier-frequency amplifier. Other applications where small power output are required.

Dimensions -Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1and 2.

Nominal operating conditions and parameters
Filament voltage ……………………………………………………………… 4.5V
Nominal filament current …………………………………………………… 1.0A
Plate voltage ………………………………………………………………… 160V
Grid voltage ………………………………………………………………… -12V
Plate resistance ………………………………………………………… 5.3kohms
Plate current ………………………………………………………………… 9.9mA
Amplification factor ………………………………………………………… 6.2

*Direct-current filament supply is used. The grid and platter returns are connected to the negative end of the filament.

Characteristics-Average characteristics
Figure 3. shown typical curves of plate currents of grid voltage for several values of plate voltages. It is alternating-current filament supply.

Fig 3

Limiting Operation Conditions for Safe Nor simultaneous ratings
Maximum plate voltage …………………………………………………… 190 volts
Maximum plate current …………………………………………………… 15mA