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 Radio Detector Converter ·Tetrode-Triode
5CL8A
Medium-mu triode and sharp-cutoff tetrode used as a combined VHF oscillator and mixer in television receivers.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- 9FX
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 4.7 V / 600 mA
Description
Medium-mu triode and sharp-cutoff tetrode used as a combined VHF oscillator and mixer in television receivers. Electrical ratings, characteristics, and capacitances were interpreted from the supplied RCA manual excerpt where reproduced; reference-only entries were not supplemented from outside sources.
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
- 9FX
- 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
9FX - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1Base Pin | B | G1 — Control Grid Literal label 2G1; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9FX |
| PIN2Base Pin | B | P — Plate (Anode) Literal label 2P; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9FX |
| PIN3Base Pin | B | K — Cathode Literal label 2K; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9FX |
| PIN4Base Pin | — | H — Heater Literal label H; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9FX |
| PIN5Base Pin | — | H — Heater Literal label H; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9FX |
| PIN6Base Pin | A | P — Plate (Anode) Literal label 1P; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9FX |
| PIN7Base Pin | A | G2 — Screen Grid Literal label 1G2; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9FX |
| PIN8Base Pin | A | K — Cathode Literal label 1K; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9FX |
| PIN9Base Pin | A | G1 — Control Grid Literal label 1G1; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9FX |
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
- 2.7 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
- 100000 Ω
- Transconductance
- 0.0064 S
- Max plate voltage
- 300 V
- Max screen voltage
- 300 V
- Max plate dissipation
- 2.8 W
- Max screen dissipation
- 0.5 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
1965 Westinghouse Data Book
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Triode typical plate voltage
125 V
Heater-cathode voltage maximum
200 V
Characteristics
Triode transconductance
8000 uS
Triode amplification factor
40
Triode plate resistance
5000 ohm
Heater warm-up time
11 s
Application
Application
Oscillator / phase inverter / vertical oscillator
SECTION 2
Tetrode
Other
Pentode/tetrode typical plate voltage
125 V
Pentode/tetrode grid2 voltage
125 V
Characteristics
Pentode/tetrode transconductance
6500 uS
Pentode/tetrode plate resistance
200000 ohm
Application
Application
Mixer / IF / video / general-purpose amplifier
Data set 03
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 transconductance
6400 µS
TetrodeSection
Other
Application
VHF oscillator-mixer
TelevisionService
Electrical equivalence
6CL8A except heater ratings
Published statement
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 mA
TetrodeSection
Data set 04
1968 General Electric Co
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Heater Warmup Time
11 s
Data set 05
1971 RCA HB3 Binder 4 of 7
Published operating points and test conditions from this source.
SECTION 1
Triode
Capacitance
Triode grid-to-plate capacitance
1.8 pF
Triode input capacitance
2.8 pF
Triode output capacitance
1.5 pF
WithoutShield
Other
Plate voltage
125 V
ClassA
Grid #1 voltage
-1 V
ClassA
Plate current
24 mA
ClassA
Heater/filament voltage
4.7 V
DerivativeSheet
Heater/filament current
600 mA
DerivativeSheet
Heater warm-up time
11 s
ControlledWarmup
SECTION 2
Tetrode
Capacitance
Tetrode grid-to-plate capacitance
0.02 pF
WithoutShield
Tetrode grid-to-plate capacitance
0.01 pF
WithShield
Tetrode input capacitance
5 pF
Tetrode output capacitance
2 pF
WithoutShield
Other
Plate voltage
125 V
ClassA
Grid #2 voltage
125 V
ClassA
Grid #1 voltage
-1 V
ClassA
Plate current
12 mA
ClassA
Grid #2 current
4 mA
ClassA
Characteristic
Zero-bias transconductance
7000 uS
Eb=100V;Ec2=70V
Data set 06
1975 RCA RC30
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristics
Plate supply voltage
125 V
ClassA
Grid voltage
-1 V
ClassA
Plate current
14 mA
ClassA
SECTION 2
Tetrode
Characteristics
Plate supply voltage
125 V
ClassA
Screen voltage
125 V
ClassA
Grid voltage
-1 V
ClassA
Plate current
12 mA
ClassA
Screen current
4 mA
ClassA