Data set 01
1964 RMA EIA
Published operating points and test conditions from this source.
SECTION 1
Triode
CrossReference
Cross-reference / electrical identity
7GS7
Characteristics
Heater voltage
4 V
Heater current
600 mA
Voltage Triode Pentode ·Pentode-Triode
4GS7
Triode-pentode electrically equivalent to 7GS7 except for its 4.0-volt, 0.6-ampere heater.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 4 V / 600 mA
Description
JEDEC-registered type electrically identical to 7GS7 except for 4.0 V, 0.6 A heater.
Socket description
Small-button Noval 9-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B9A
- Base pins
- 9
- Nominal heater voltage
- 4 V
- Nominal heater current
- 600 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 5000 Ω
- Transconductance
- 0.0055 S
- Amplification factor
- 17
- Max plate voltage
- 250 V
- Max plate dissipation
- 2 W
- Max cathode current
- 15 mA
Triode section; 4GS7 is electrically identical to 7GS7 except heater characteristics.
Section 2
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 435000 Ω
- Transconductance
- 0.012 S
- Max plate voltage
- 250 V
- Max screen voltage
- 150 V
- Max plate dissipation
- 2 W
- Max screen dissipation
- 0.5 W
- Max cathode current
- 18 mA
Pentode section; ratings inherited from electrically identical 7GS7 per 4GS7 registration sheet.
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.