Data set 01
1958 Mullard Receiving Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Application
RF / IF amplifier
Voltage Pentode ·Pentode
6CB6
High-transconductance sharp-cutoff pentode developed for television RF and IF amplification in VHF tuner and intermediate-frequency stages.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 7CM
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 6.3 V / 300 mA
Description
Indirectly heated fixed-slope pentode intended for RF amplification.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 7CM
- Socket code
- B7G
- Base pins
- 7
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 300 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
7CM - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1G1 | A | G1 — Control Grid EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CM |
| PIN2K | A | K — Cathode EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CM |
| PIN3H | — | H — Heater EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CM |
| PIN4H | — | H — Heater EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CM |
| PIN5P | A | P — Plate (Anode) EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CM |
| PIN6G2 | A | G2 — Screen Grid EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CM |
| PIN7G3 | A | G3 — Suppressor GridGroup 7CM7 EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CM |
| PIN7IS | A | IS — Internal ScreenGroup 7CM7 EIA chart transcription; manufacturer verification pending | Unverified EIA Base Connections, printed page 128, 7CM |
Section ratings
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 280000 Ω
- Transconductance
- 0.008 S
- Max plate voltage
- 330 V
- Max screen voltage
- 150 V
- Max plate dissipation
- 2.3 W
- Max screen dissipation
- 0.6 W
Sharp-cutoff pentode.
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
195X General Electric Essential Characteristics
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate voltage
200 V
ClassA
Screen-grid voltage
150 V
ClassA
Cathode resistor
180 ohm
ClassA
Plate current
9.5 mA
ClassA
Screen-grid current
2.8 mA
ClassA
Capacitance
Input capacitance
6.5 pF
Output capacitance
2 pF
Grid-to-plate capacitance
0.02 pF
Data set 03
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Heater voltage
6.3 V
Heater current
300 mA
Plate voltage
330 V
Typical operating conditions
Plate current
13 mA
Typical operating conditions
Data set 04
1963 Mullard
Published operating points and test conditions from this source.
SECTION 1
Pentode
Capacitance
Input capacitance
6.5 pF
Shielded
Output capacitance
3 pF
Shielded
Grid-to-plate capacitance maximum
0.01 pF
Shielded
Characteristics
Plate voltage
200 V
Screen-grid voltage
150 V
Control-grid voltage
-2.2 V
Plate current
9.5 mA
Screen-grid current
2.8 mA
Plate resistance
600000 Ohm
Transconductance
8000 uS
Control-grid cutoff voltage
-8 V
Ia=10uA
Other
Plate cold voltage
550 V
Screen-grid cold voltage
550 V
Heater-to-cathode voltage peak
200 V
Data set 05
1965 Sylvania Electronic Tubes Vol3
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate voltage
125 V
Screen-grid voltage
125 V
Cathode bias resistor
56 Ohm
Plate current
13 mA
Characteristics
Plate resistance
280000 Ohm
Transconductance
8000 uS
Control-grid cutoff voltage
-6.5 V
Capacitance
Grid-to-plate capacitance
0.025 pF
Unshielded
Input capacitance
6.5 pF
Unshielded
Output capacitance
2 pF
Unshielded
Data set 06
1965 Westinghouse Data Book
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Heater Voltage
6.3 V
Heater Current
300 mA
Transconductance
10000 uS
RepresentativePublishedPoint
Plate Resistance
280000 ohm
RepresentativePublishedPoint
Other
Maximum Plate Voltage
330 V
Maximum Plate Dissipation
2.3 W
Data set 07
1966 Tung Sol Electronic Tubes 2 of 4
Published operating points and test conditions from this source.
SECTION 1
Pentode
Capacitance
Grid-to-plate capacitance without shield
0.025 pF
Grid-to-plate capacitance with shield
0.015 pF
Input capacitance
6.5 pF
Output capacitance without shield
2 pF
Output capacitance with shield
3 pF
Other
Plate voltage
125 V
ClassA
Grid #2 voltage
125 V
ClassA
Cathode bias resistor
56 ohm
ClassA
Plate current
13 mA
ClassA
Grid #2 current
3.7 mA
ClassA
Characteristic
Grid #1 voltage at 20 uA plate current
-6.5 V
Data set 08
1968 Mazda Belvu
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Heater voltage ….….……...….….…cesenserse caonde conmessnee vf
6.33 V
Heater current … … If
300 MA
Tension d'anod@E ...c Va
300 V
Screen-grid voltage …..………..…ececririnerecenesennennnnennns V8a
150 V
Plate dissipation …… ; … Pa
2 W
Screen-grid dissipation … . … Peg,
0.5 W
TTension de crête entre f11ament et cathode mueeer VEKCT
200 V
Tension d'AnOdE ….......…..….…erereesrieeneenansesinncnes Vä
200 V
Screen-grid voltage ...c VEZ
150 V
RÉSISTANCE INtEInE ….…riresenaiereennsennnnennnnnnnnnne P
6 MΩ
Transconductance
6.2 mA/V
ce VEL bl
-8 V
cccc T
9.5 mA
Courant de grille n° 2 ….….......…eerensesecerereenceceness Î2
2.8 mA
ï Va =
0 V
Characteristic
Capacitance d'entrée
6.3 pF
InterelectrodeCapacitance
Capacitance de sortie
1.9 pF
InterelectrodeCapacitance
Capacitance anode/ grille n° 1 ….c Ca/ @
20 pF
InterelectrodeCapacitance
Capacitance d'entrée ….…….……ererermescerenenamatenne Ce
6.5 pF
InterelectrodeCapacitance
Capacitance de sortie ……n Cs
3 pF
InterelectrodeCapacitance
Capacitance anode/ grille n° 1 ……c Ca/ ë;
10 pF
InterelectrodeCapacitance
Data set 09
1971 RCA HB3 Binder 4 of 7
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Heater negative with respect to cathode
200 V
Heater positive with respect to cathode
2004 V
E ~. =
6.3 V
GRtD-N
42 V
Published table column 1 of 2
GRtD-N
150 V
Published table column 2 of 2
Ep=
8.3 V
PLATE VOLTS=
200 V
GRID-Ns
2 V
Published table column 1 of 2
GRID-Ns
50 V
Published table column 2 of 2
Other
Plate Voltage
200 V
Cathode—Bias Resistor
180 Ω
Plate Resistance (Approx )
0.6 MΩ
Transconductance
6200 µS
plate current of
10 V
Plate Current
9.5 mA
Grid—No
2 mA
Published table column 1 of 2
Grid—No
2.8 mA
Published table column 2 of 2