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TJ Fullmusic 205D Data Sheet

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

Application -Audio amplifier Class A Service, Radio Amplifier Class B Service. Oscillater Class C Service.

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.

205D_01_en

Nominal operating conditions and parameters
Filament voltage* ………………………………………………………… 4.5V
Nominal filament current …………………………………………… …… 1.2A
Plate voltage ………………………………………………………………… 300V
Grid voltage** ……………………………………………………………… -24V
Plate current ………………………………………………………………… 15mA
Amplification factor …………………………………………………………… 7.3
Grid current ………………………………………………………………… 0.05 μ A
Plate resistance …………………………………………………………… 5.0 kohms

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

205D_02

Fig 3

Limiting Operation Conditions for Safe Nor simultaneous ratings
Maximum plate voltage ………………………………………………… 400 volts
Maximum plate dissipation …………………………………………… 14 watts
Maximum plate current ………………………………………………… 50mA

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