Voltage Radio Detector Converter ·Heptode
Classic pentagrid mixer and amplifier for radio frequency conversion, modulation, and first-detector service using a separate oscillator.
Pentagrid mixer/amplifier tube for frequency-converter and modulator service.
International Octal
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
Source-defined physical/function section.
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 voltage
250 V
AsMixer
Screen voltage
150 V
AsMixer
Signal-grid voltage
-6 V
AsMixer
Oscillator-grid voltage
-15 V
AsMixer
Peak oscillator voltage
18 V
AsMixer
Plate current
3.3 mA
AsMixer
Screen current
8.3 mA
AsMixer
Conversion conductance
350 uS
AsMixer
Plate resistance
0.8 MOhm
AsAmplifier
Mutual conductance
1100 uS
AsAmplifier
Data set 02
Published operating points and test conditions from this source.
Grid Voltage
-3 V
is with a No. 1 grid voltage of -3, and a screen voltage
Grid Voltage
150 V
of -6 and a screen grid voltage of 150. These two ratings
Plate Voltage
250 V
Plate Voltage 250 Volts Max.
Screen Voltage
100 V
Screen Voltage (Grids No. 2 and 4) 100 Volts Max.
Grid Voltage
-3 V
Control Grid Voltage (Grid No. 1 -3 Volts Min.
Control Grid Voltage
-3 V
Control Grid Voltage (Grid No. 3 -3 Volts Min.
Plate Current
5.3 mA
Plate Current 5.3 Milliamperes
Screen Current
5.5 mA
Screen Current 5.5 Milliamperes
Plate Resistance
800000 ohm
Plate Resistance 800,000 Ohms
Mutual Conductance
1100 µS
Mutual Conductance 1100 Micromhos
Amplification Factor
880 ratio
Amplification Factor 880
Plate Voltage
250 V
Plate Voltage 250 250 Max. ** Volts
Screen Voltage
150 V
Screen Voltage (Grids No. 2 and 4) 100 150 Max. *% Volts
Grid Voltage
-6 V
Signal-Grid Voltage (Grid No. 1) -3 -6 Min. *% Volts
Grid Voltage
-15 V
#0scillator-Grid Voltage EGrid No. 3) -10 -15 Volts
Peak Oscillator Voltage
18 V
Peak Oscillator Voltage (Applied to Grid No. 3) 12 18 Volts Min.
Plate Current
3.3 mA
Plate Current 2.4 3.3 Milliamperes
Screen Current
8.3 mA
Screen Current 6.2 8.3 Milliamperes
Plate Resistance
1 Mohm
Plate Resistance 1.0 1.0 Megohm or greater
Data set 03
Published operating points and test conditions from this source.
Maximum plate voltage
250 V
Published datasheet rating
Maximum screen voltage
150 V
Published datasheet rating
Plate voltage
250 V
ClassA
Screen voltage
100 V
ClassA
Screen current
6.5 mA
ClassA
Plate resistance
800000 ohm
Published datasheet characteristic
Transconductance
1100 µS
Published datasheet characteristic
Amplification factor
880
Published datasheet characteristic
Heater voltage
6.3 V
Published heater rating
Heater current
300 mA
Published heater rating
Data set 04
Published operating points and test conditions from this source.
Heater voltage
6.3 V
Published nominal value
Heater current
300 mA
Published nominal value
Conversion conductance
350 µS
Mixer service
Application
Mixer with separate oscillator
Superheterodyne frequency conversion
Data set 05
Published operating points and test conditions from this source.
Plate voltage
250 V
ClassA
Screen voltage
100 V
ClassA
Control-grid voltage
-3 V
ClassA
Plate current
5.3 mA
ClassA
Screen current
6.5 mA
ClassA
Plate resistance
600000 Ω
ClassA
Transconductance
1100 µS
ClassA
Data set 06
Published operating points and test conditions from this source.
Heater voltage
6.3 V
Heater current
300 mA
Plate current
5.3 mA
Typical operating conditions