Power - Triode ·Triode
Filamentary power triode developed for power-amplifier applications, with operating information emphasizing output service and substantial plate loading. Its documented role is best understood as a general power triode.
Transmitting/power triode for RF amplification, oscillation, modulation, and audio output.
Medium 4-contact bayonet base
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Promoted fields mapped from published ratings/characteristics; additional published values preserved in parameter table.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Plate-filament capacitance
3 pF
Published direct interelectrode capacitance
Grid-filament capacitance
2 pF
Published direct interelectrode capacitance
Data set 02
Published operating points and test conditions from this source.
Filament Voltage
4.5 Volt
Filament Voltage 4.5 Volts, AC or DC
Average A m p l i fi c a t i o n Factor
7.3
Average A m p l i fi c a t i o n Factor 7.3
voltage of
375 volt
voltage of 375 volts and a total plate current of approximately 42 milliamperes, two No. 205E tubes will give 2.4
watts output with a total harmonic content of the order of
1 watts
watts output with a total harmonic content of the order of 1.0 per cent.
Peak Power Output
12 Watts
Peak Power Output 12 Watts
The No
205
The No. 205E Tube will operate satisfactorily at or above 30,000 kilocycles if the radio
Audio-frequency amplifier or modulator where power outputs of approximately
1 watt
Audio-frequency amplifier or modulator where power outputs of approximately 1 watt or less
Filament voltage
4.5 volt
Filament voltage 4.5 volts, a.c. or d.c.
Nominal fi l a m e n t current
1.6 amperes
Nominal fi l a m e n t current 1.6 amperes
Microphonic Noise—With a plate voltage of
350 volt
Microphonic Noise—With a plate voltage of 350 volts, a grid bias of —22.5 volts, and a load
resistance of
100000 ohms
resistance of 100,000. ohms, the mean microphonic noise output level of 205E tube measured
♦Carrier conditions for use with modulation factors up to
1
♦Carrier conditions for use with modulation factors up to 1.0.
the area, ABCD, in Figure
3
the area, ABCD, in Figure 3. Amplification factor, plate resistance, transconductance, and
If the
205 megacycles
If the 205E tube is to be used at frequencies higher than 15 megacycles, the plate voltage and
FILAMENT VOLTAGE =
4.5 VOLT
FILAMENT VOLTAGE = 4.5 VOLTS DC.
Maximum Plate Voltage
400 Volt
Maximum Plate Voltage 400 Volts
Maximum Plate Current
50 Milliamperes
Maximum Plate Current 50 Milliamperes
Maximum Plate Dissipation
14 Watts
Maximum Plate Dissipation 14 Watts
Maximum DC Plate Current
50 Milliamperes
Maximum DC Plate Current 50 Milliamperes
Maximum Plate Dissipation
14 Watt
Maximum Plate Dissipation 14 Watt's
Maximum Non-modulated DC Plate Voltage
400 Volt
Maximum Non-modulated DC Plate Voltage 400 Volts
Maximum Modulated DC Plate Voltage
350 Volt
Maximum Modulated DC Plate Voltage 350 Volts
Maximum direct plate voltage
400 volt
Maximum direct plate voltage 400 4 0 0 400 350 volts
Maximum direct plate current
50 milliamperes
Maximum direct plate current 50 35 50 40 milliamperes
Maximum plate dissipation
14 watts
Maximum plate dissipation 14 14 14 10 watts
Maximum direct grid current
10 milliamperes
Maximum direct grid current 10 10 10 milliamperes
frequency of
30 megacycles
frequency of 30 megacycles, the maximum ratings should be as follows:
Maximum plate voltage
800 volt
Maximum plate voltage 800 volts
Maximum plate dissipation
10 watts
Maximum plate dissipation 10 watts
Maximum r-f grid current
3 amperes
Maximum r-f grid current 3 amperes