Data set 01
1948 Brimar Radio Valve Manual
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
HeaterOrFilamentVoltage
1.4 V
HeaterOrFilamentCurrent
100 mA
Power - Pentode (NOT beam) ·Pentode
1S4
Power/output pentode designed for Class-A, single-ended, or push-pull audio-frequency output amplification.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 7AV
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 1.4 V / 100 mA
Description
Power-amplifier pentode for battery-operated audio output stages. Electrical ratings and representative operating data were extracted from the approved manual page.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 7AV
- Socket code
- B7G
- Base pins
- 7
- Nominal heater voltage
- 1.4 V
- Nominal heater current
- 100 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
7AV - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1G3 | A | G3 — Suppressor GridGroup 7AV1 Source EIA label G3; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7AV |
| PIN1F | — | F — FilamentGroup 7AV1 Source EIA label F; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7AV |
| PIN2P | A | P — Plate (Anode) Source EIA label P; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7AV |
| PIN3G1 | A | G1 — Control Grid Source EIA label G1; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7AV |
| PIN4G2 | A | G2 — Screen Grid Source EIA label G2; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7AV |
| PIN5G3 | A | G3 — Suppressor GridGroup 7AV5 Source EIA label G3; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7AV |
| PIN5F | — | F — FilamentGroup 7AV5 Source EIA label F; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7AV |
| PIN6P | A | P — Plate (Anode) Source EIA label P; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7AV |
| PIN7F | — | F — Filament Source EIA label F; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7AV |
Section ratings
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 100000 Ω
- Transconductance
- 0.001575 S
- Max plate voltage
- 90 V
- Max screen voltage
- 67.5 V
- Max cathode current
- 11 mA
Power-amplifier pentode for battery-operated audio output stages.
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
1958 Brimar Radio Valve No 7
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Referenced Characteristics
Type 3S4, parallel filament connection
Source explicitly refers to 3S4; values not invented
Data set 03
195X General Electric Essential Characteristics
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate voltage
90 V
ClassA; OperatingPoint1
Screen voltage
67.5 V
ClassA; OperatingPoint1
Control-grid bias
7 V
ClassA; OperatingPoint1
Plate current
7.4 mA
ClassA; OperatingPoint1
Screen current
1.4 mA
ClassA; OperatingPoint1
Load resistance
8000 ohm
ClassA; OperatingPoint1
Power output
0.27 W
ClassA; OperatingPoint1
Plate voltage
67.5 V
ClassA; OperatingPoint2
Screen voltage
67.5 V
ClassA; OperatingPoint2
Control-grid bias
7 V
ClassA; OperatingPoint2
Plate current
7.2 mA
ClassA; OperatingPoint2
Screen current
1.5 mA
ClassA; OperatingPoint2
Load resistance
5000 ohm
ClassA; OperatingPoint2
Power output
0.18 W
ClassA; OperatingPoint2
Plate voltage
45 V
ClassA; OperatingPoint3
Screen voltage
45 V
ClassA; OperatingPoint3
Control-grid bias
4.5 V
ClassA; OperatingPoint3
Plate current
3.8 mA
ClassA; OperatingPoint3
Screen current
0.8 mA
ClassA; OperatingPoint3
Load resistance
8000 ohm
ClassA; OperatingPoint3
Power output
0.065 W
ClassA; OperatingPoint3