Voltage Pentode - Sharp Cutoff (single) ·Pentode
Sharp-cutoff pentode for television IF amplification and VHF tuner RF stages.
Sharp-cutoff pentode used as a television IF amplifier to about 45 MHz and as an RF amplifier in VHF television tuners.
Miniature 7-contact
General specifications
Properties common to every published source and operating point.
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 |
1 physical section, each with unique specifications.
Section 1
Sharp-cutoff RF pentode.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
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
Input capacitance
6.5 pF
Output capacitance
2 pF
Grid-to-plate capacitance
0.02 pF
Data set 02
Published operating points and test conditions from this source.
Heater voltage
6.3 V
Heater current
300 mA
Plate voltage
350 V
Typical operating conditions
Plate current
12.5 mA
Typical operating conditions
Data set 03
Published operating points and test conditions from this source.
Plate voltage
125 V
Screen-grid voltage
125 V
Cathode bias resistor
56 Ohm
Plate current
12.5 mA
Screen-grid current
3.7 mA
Plate resistance
300000 Ohm
Transconductance
7800 uS
Control-grid cutoff voltage
-6 V
Grid-to-plate capacitance
0.025 pF
Unshielded
Input capacitance
6.5 pF
Unshielded
Output capacitance
2 pF
Unshielded
Data set 04
Published operating points and test conditions from this source.
Heater Voltage
6.3 V
Heater Current
300 mA
Transconductance
7800 uS
RepresentativePublishedPoint
Plate Resistance
300000 ohm
RepresentativePublishedPoint
Maximum Plate Voltage
300 V
Maximum Plate Dissipation
2 W
Data set 05
Published operating points and test conditions from this source.
Grid-to-plate capacitance
0.025 pF
WithoutShield
Grid-to-plate capacitance
0.015 pF
WithShield
Input capacitance
6.5 pF
WithoutShield
Output capacitance
2 pF
WithoutShield
Output capacitance
3 pF
WithShield
Plate voltage
125 V
ClassA
Grid #2 voltage
125 V
ClassA
Cathode bias resistor
56 ohm
ClassA
Plate current
12.5 mA
ClassA
Grid #2 current
3.7 mA
ClassA
Plate current at grid #1 -3 V
2.2 mA
Data set 06
Published operating points and test conditions from this source.
about
45 MHz
Published in approved 6CF6 target datasheet entry; Section1
Heater Voltage (ac/dc) 3.15 4.2
6.3 V
Published in approved 6CF6 target datasheet entry; Section1
Heater Current 0.6 0.45
300 mA
Published in approved 6CF6 target datasheet entry; Section1
Heater Warm-up Time (Average) 11 11
11 seconds
Published in approved 6CF6 target datasheet entry; Section1
Plate Voltage
330 V
Published in approved 6CF6 target datasheet entry; Section1
Grid-No.S (Suppressor-Grid) Voltage, Positive value
0 V
Published in approved 6CF6 target datasheet entry; Section1
Grid-No.2 Supply Voltage
330 V
Published in approved 6CF6 target datasheet entry; Section1
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 V
Published in approved 6CF6 target datasheet entry; Section1
For grid-No.2 voltages between 165 and
330 V
Published in approved 6CF6 target datasheet entry; Section1
Plate Supply Voltage
125 V
Published in approved 6CF6 target datasheet entry; Section1
Cathode-Sias Resistor
56 Ω
Published in approved 6CF6 target datasheet entry; Section1
Grid-No.2 Current
3.7 mA
Published in approved 6CF6 target datasheet entry; Section1
Grid-No.l VoJt&ge (Approx.) for plate current of 20 jiA
-6.5 V
Published in approved 6CF6 target datasheet entry; Section1
Grid-No.l Voltage (Approx.) for plate current of
2.8 mA
Published in approved 6CF6 target datasheet entry; Section1
Grid-No.l Voltage (Approx.) for plate current of 2.8 mA
-3 V
Published in approved 6CF6 target datasheet entry; Section1
Grid No. 3. and Internal Shield 6.5
6.6 pF
Published in approved 6CF6 target datasheet entry; Section1