Data set 01
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Plate voltage
125 V
ClassA
SECTION 2
Tetrode
Other
Plate voltage
125 V
ClassA
Voltage Triode Tetrode ·Tetrode-Triode
5CQ8
Medium-mu triode and sharp-cutoff tetrode for television mixer, IF-amplifier, and related signal service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- 9GE
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 4.7 V / 600 mA
Description
5CQ8 is described in the supplied Tung-Sol datasheet as a medium-mu triode and sharp-cutoff tetrode for television service. The redo includes a substantive section-electrical extraction from ratings and characteristic tables.
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
- 9GE
- Socket code
- B9A
- Base pins
- 9
- Nominal heater voltage
- 4.7 V
- Nominal heater current
- 600 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
9GE - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1Base Pin | A | P — Plate (Anode) Literal label 1P; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GE |
| PIN2Base Pin | B | G1 — Control Grid Literal label 2G1; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GE |
| PIN3Base Pin | B | G2 — Screen Grid Literal label 2G2; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GE |
| PIN4Base Pin | — | H — Heater Literal label H; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GE |
| PIN5Base Pin | — | H — Heater Literal label H; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GE |
| PIN6Base Pin | B | P — Plate (Anode) Literal label 2P; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GE |
| PIN7Base Pin | B | K — CathodeGroup 9GE7 Literal label 2K; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GE |
| PIN7Base Pin | — | IS — Internal ScreenGroup 9GE7 Literal label IS; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GE |
| PIN8Base Pin | A | K — Cathode Literal label 1K; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GE |
| PIN9Base Pin | A | G1 — Control Grid Literal label 1G1; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GE |
Section ratings
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 5000 Ω
- Transconductance
- 0.008 S
- Amplification factor
- 40
- Max plate voltage
- 300 V
- Max plate dissipation
- 3 W
- Rectifier max heater-cathode voltage
- 200 V
- Rectifier warm-up time
- 11 s
Referenced ratings not printed in this source; not inferred.
Section 2
Tetrode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 140000 Ω
- Transconductance
- 0.0058 S
- Max plate voltage
- 300 V
- Max screen voltage
- 300 V
- Max plate dissipation
- 3.2 W
- Max screen dissipation
- 0.7 W
- Rectifier max heater-cathode voltage
- 200 V
- Rectifier warm-up time
- 11 s
Referenced ratings not printed in this source; not inferred.
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
1966 Tung Sol Electronic Tubes 1 of 4
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Heater/filament voltage
4.7 V
Published rating
Heater/filament current
600 mA
Published rating
Triode transconductance
8000 µS
TriodeSection
Triode amplification factor
40
TriodeSection
Tetrode plate resistance
340000 ohm
TetrodeSection
Tetrode transconductance
5800 µS
TetrodeSection
Other
Application
Television oscillator, mixer and RF amplifier
TelevisionService
Triode plate voltage
125 V
TriodeSection
Triode plate current
15 mA
TriodeSection
Tetrode plate voltage
125 V
TetrodeSection
Tetrode screen voltage
125 V
TetrodeSection
Tetrode plate current
12 mA
TetrodeSection
Tetrode screen current
4.2 mA
TetrodeSection
Data set 03
1968 General Electric Co
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Heater Warmup Time
11 s
Data set 04
1971 RCA HB3 Binder 4 of 7
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Plate voltage
125 V
Triode;ClassA
Grid voltage
-1 V
Triode;ClassA
Plate current
15 mA
Triode;ClassA
Heater/filament voltage
4.7 V
DerivativeSheet
Heater/filament current
600 mA
DerivativeSheet
Heater warm-up time
11 s
ControlledWarmup
Characteristic
Plate resistance
5200 ohm
Triode
Transconductance
7500 uS
Triode
Amplification factor
40
Triode
Capacitance
Grid-to-plate capacitance
1.8 pF
Triode
SECTION 2
Tetrode
Other
Plate voltage
125 V
Tetrode;ClassA
Screen voltage
125 V
Tetrode;ClassA
Grid voltage
-1 V
Tetrode;ClassA
Plate current
12 mA
Tetrode;ClassA
Screen current
4 mA
Tetrode;ClassA
Characteristic
Plate resistance
200000 ohm
Tetrode
Transconductance
7500 uS
Tetrode
Capacitance
Grid-to-plate capacitance
0.01 pF
Tetrode