Data set 01
1968 General Electric Co
Published operating points and test conditions from this source.
SECTION 1
Hexode
Other
Heater warm-up time
11 s
Hexode ·Hexode
3FS5
Beam hexode designed as an RF amplifier in VHF television receivers, differing from the 6FS5 primarily in heater characteristics.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 7GA
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 2.9 V / 450 mA
Description
Beam hexode used as an RF amplifier in VHF television receivers.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 7GA
- Socket code
- B7G
- Base pins
- 7
- Nominal heater voltage
- 2.9 V
- Nominal heater current
- 450 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
7GA - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1G1 | A | G1 — Control Grid EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 7GA |
| PIN2G2 | A | G2 — Screen GridGroup 7GA2 EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 7GA |
| PIN2G4 | A | G4 — Fourth GridGroup 7GA2 EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 7GA |
| PIN2K | A | K — CathodeGroup 7GA2 EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 7GA |
| PIN3H | — | H — Heater EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 7GA |
| PIN4H | — | H — Heater EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 7GA |
| PIN5P | A | P — Plate (Anode) EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 7GA |
| PIN6G3 | A | G3 — Suppressor Grid EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 7GA |
| PIN7G2 | A | G2 — Screen GridGroup 7GA7 EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 7GA |
| PIN7G4 | A | G4 — Fourth GridGroup 7GA7 EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 7GA |
| PIN7K | A | K — CathodeGroup 7GA7 EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 7GA |
Section ratings
1 physical section, each with unique specifications.
Section 1
Hexode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 240000 Ω
- Transconductance
- 0.01 S
- Max plate voltage
- 300 V
- Max screen voltage
- 150 V
- Max plate dissipation
- 3.25 W
- Max screen dissipation
- 0.16 W
- Max cathode current
- 20 mA
Sparse-source exception: this sheet does not reproduce the electrical ratings/characteristics of 6FS5; no external values imported.
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
1975 RCA RC30
Published operating points and test conditions from this source.
SECTION 1
Hexode
Other
Heater Voltage (ac/dc) 2.4 2.9
6.3 V
Published in approved 6FS5 target entry; Section1
Heater Current 0.6 0.45
200 mA
Published in approved 6FS5 target entry; Section1
Heater Warm-up Time (Average) 11
11 seconds
Published in approved 6FS5 target entry; Section1
Plate Voltage
300 V
Published in approved 6FS5 target entry; Section1
Grid-No.3 (Screen-Grid) Voltage
150 V
Published in approved 6FS5 target entry; Section1
Negative-bias value
60 V
Published in approved 6FS5 target entry; Section1
Positive-bias value
0 V
Published in approved 6FS5 target entry; Section1
Cathode Current
20 mA
Published in approved 6FS5 target entry; Section1
Plate Dissipation
3.25 W
Published in approved 6FS5 target entry; Section1
Grid-No.3 Input
0.16 W
Published in approved 6FS5 target entry; Section1
Plate Voltage
275 V
Published in approved 6FS5 target entry; Section1
Grid-No.3 Voltage
135 V
Published in approved 6FS5 target entry; Section1
Grid-No.l Voltage
-0.2 V
Published in approved 6FS5 target entry; Section1
Grid-No.l-Circuit Resistance, for fixed-bias operation
0.5 MΩ
Published in approved 6FS5 target entry; Section1
Capacitance
Grid No.l to Plate 0.03
0.016 pF
Published in approved 6FS5 target entry; Section1
No.3, and Grid No.4
4.8 pF
Published in approved 6FS5 target entry; Section1
and Grid No
4 pF
Published in approved 6FS5 target entry; Section1
Characteristic
Plate Resistance (Approx. )
0.24 MΩ
Published in approved 6FS5 target entry; Section1
Transconductance
10000 µS
Published in approved 6FS5 target entry; Section1
Plate Current
9 mA
Published in approved 6FS5 target entry; Section1
Grid-No.3 Current
0.17 mA
Published in approved 6FS5 target entry; Section1
Grid-No.l Voltage (Approx.) for transconductance of
100 µS
Published in approved 6FS5 target entry; Section1
Grid-No.l Voltage (Approx.) for transconductance of 100 /imhos
-5 V
Published in approved 6FS5 target entry; Section1