Data set 01
1956 Western Electric Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Service
General-purpose voltage amplification
Voltage Pentode ·Pentode
310A
Western Electric heater-cathode general-purpose pentode designed for voltage amplification.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 7K
- Socket code
- OCTAL7
- Base pins
- 7
- Nominal heater
- 10 V / 320 mA
Description
General-purpose heater-cathode pentode for voltage amplification.
Socket description
7-contact octal-family base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 7K
- Socket code
- OCTAL7
- Base pins
- 7
- Nominal heater voltage
- 10 V
- Nominal heater current
- 320 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
7K - Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 750000 Ω
- Transconductance
- 0.0018 S
- Max plate voltage
- 250 V
- Max screen voltage
- 180 V
- Max plate dissipation
- 2.5 W
- Max screen dissipation
- 0.4 W
- Max cathode current
- 10 mA
Promoted fields audited from printed ratings/characteristics; remaining published values preserved as parameters.
Source-dependent data
Operating conditions by source
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 02
195X Raytheon Special Purpose Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate Voltage
135 V
Grid 1 Voltage
-3 V
Grid 2 Voltage
135 V
Plate Current
5.5 mA
Characteristic
Plate Resistance
0.75 Mohm
Transconductance
1800 uS
Data set 03
2026 Western Electric 300s
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Heater voltage
10 volt
Heater voltage 10.0 volts, a.c. or d.c.
Nominal heater current
0.32 ampere
Nominal heater current 0.32 ampere
are shown in Figures
3 volt
are shown in Figures 3 and 4, respectively, as functions of control-grid voltage for several values
screen-grid current characteristics as functions of plate voltage are given in Figures
8 volt
screen-grid current characteristics as functions of plate voltage are given in Figures 8 and 9,
respectively, for several values of control-grid voltage, a screen-grid voltage of
135 volt
respectively, for several values of control-grid voltage, a screen-grid voltage of 135 volts, and zero
of plate voltage for several values of suppressor-grid voltage, a screen-grid voltage of
135 volt
of plate voltage for several values of suppressor-grid voltage, a screen-grid voltage of 135 volts,
and a control-grid voltage of
-3 volt
and a control-grid voltage of —3 volts. These last characteristics are of particular interest in
HEATER VOLTAGE =
10 VOLT
HEATER VOLTAGE =10 VOLTS Ep=Eca=180 1575
— SUPPRESSOR-GRID VOLTAGE =
0 VOLT
— SUPPRESSOR-GRID VOLTAGE =0 AL LA
HEATER VOLTAGE =
10 VOLT
HEATER VOLTAGE =10VOLTS
SUPPRESSOR GRID VOLTAGE =
0 VOLT
SUPPRESSOR GRID VOLTAGE =0
HEATER VOLTAGE =
10 VOLT
HEATER VOLTAGE = 10 VOLTS
SCREEN-GRID VOLTAGE =
135 VOLT
SCREEN-GRID VOLTAGE =135 VOLTS
Published value
14 VOLT
14 SUPPRESSOR-GRID VOLTAGE = 0
\\ SCREEN - GRID VOLTAGE =
135 VOLT
\\ SCREEN - GRID VOLTAGE =135 VOLTS
Published value
4 VOLT
4 SUPPRESSOR-GRID VOLTAGE =0
HEATER VOLTAGE=
10 VOLT
HEATER VOLTAGE=10 VOLTS
SCREEN-GRID VOLTAGE =
135 VOLT
SCREEN-GRID VOLTAGE =135 VOLTS Ec1=-6
SUPPRESSOR-GRID VOLTAGE =
0 VOLT
SUPPRESSOR-GRID VOLTAGE =0 fe -5
Other
Maximum plate voltage
250 volt
Maximum plate voltage 250 volts
Maximum screen-grid voltage
180 volt
Maximum screen-grid voltage 180 volts
Maximum cathode current (screen-grid current plus plate current)
10 milliamperes
Maximum cathode current (screen-grid current plus plate current) 10 milliamperes
Maximum screen-grid current
2.5 milliamperes
Maximum screen-grid current 2.5 milliamperes