Voltage - Dual Triode (similar high frequency) ·Triode-Triode
Improved common-cathode twin triode for VHF amplifier, mixer, and push-pull oscillator service, including Class-C RF operation in compact high-frequency equipment.
Miniature type used as combined rf power amplifier and oscillator or as twin af amplifier. With push-pull arrangement of the grids and the plates in parallel, this typecan also be used as a mixer at frequencies as high as 600 MHz. Outlines section, 5C; requires miniature 7-contact socket. Type 5J6 is identical with 7BF type 6J6A except for heater ratings.
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 |
|---|---|---|---|
| PIN12P | B | P — Plate (Anode) EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BF |
| PIN21P | A | P — Plate (Anode) EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BF |
| PIN3H | — | H — Heater EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BF |
| PIN4H | — | H — Heater EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BF |
| PIN51G1 | A | G1 — Control Grid EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BF |
| PIN62G1 | B | G1 — Control Grid EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BF |
| PIN7K | A | K — Cathode EIA chart transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BF |
2 physical sections, each with unique specifications.
Section 1
Representative specification for repeated identical sections.
Section 2
Second physical triode section; electrically identical twin section.
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
100 V
Published operating/characteristic table
Plate Current
8.5 mA
Published operating/characteristic table
Transconductance
5300 uS
Published operating/characteristic table
Plate Resistance
7160 ohm
Published operating/characteristic table
Data set 02
Published operating points and test conditions from this source.
Heater Voltage
6.3 V
Heater Current
450 mA
Maximum Operating Frequency as Mixer
600 MHz
Maximum Plate Voltage
300 V
Maximum Plate Dissipation
1.5 W
Typical Push-Pull Oscillator Frequency
250 MHz
ClassC; PushPull
Approximate RF Output Power
1 W
ClassC; PushPull; 250MHz
Data set 03
Published operating points and test conditions from this source.
Plate voltage
100 V
ClassA1;EachSection
Plate current
8.5 mA
ClassA1;EachSection
Cathode bias resistor, both sections
50 ohm
ClassA1
RF Class C plate voltage
150 V
ClassC;PushPull;BothSections
RF Class C plate current
30 mA
ClassC;PushPull;BothSections
RF power output
3.5 W
ClassC;PushPull;BothSections
Heater warm-up time
11 s
WholeTube
Data set 04
Published operating points and test conditions from this source.
Voltage (AC or DC)
6.3 V
Published table value
Current
0 mA
Published table value column 1
Current
45 A
Published table value column 2
Current
6 A
Published table value column 3
Warm-up time (Average)
11 s
Published table value
Grid to plate
16 pF
Published table value column 1
Grid to plate
1.5 pF
Published table value column 2
Grid to cathode and heater
2.2 pF
Published table value column 1
Grid to cathode and heater
2.6 pF
Published table value column 2
Plate to cathode and heater
0.4 pF
Published table value column 1
Plate to cathode and heater
1.6 pF
Published table value column 2
Plate to cathode and heater
1 pF
Published table value column 2
Plate Supply Voltage
100 V
Published table value
Cathode Resistorb
50 Ω
Published table value
Plate Current
8.5 mA
Published table value
PLATE VOLTAGE
300 V
Published table value
PLATE DISSIPATION
1.5 W
Published table value
Heater negative with respect to cathode
100 V
Published table value
Heater positive with respect to cathode
100 V
Published table value
For cathode-bias operation
0.5 MΩ
Published table value
DC PLATE VOLTAGE
300 V
Published table value
DC PLATE CURRENT
15 mA
Published table value
DC GRID CURRENT
8 mA
Published table value
i DC PLATE INPUT
4.5 W
Published table value
DC Plate Voltage
150 V
Published table value
From a grid resistor of
625 a
Published table value
From a cathode resistor of
220 a
Published table value
DC Plate Current
30 mA
Published table value
DC Grid Current (Approx.)e
16 mA
Published table value
Useful Power Output (Approx.)
3.5 W
Published table value
a With external shield JEDEC No
316 a
Published table value
a push-pull oscillator with a plate voltage oT
150 a
Published table value
rated plate oissi pat ion, and with a grid resistor of
2000 a
Published table value
Plate Resistance (Approx.)
7100 Ω
Published table value
Transconductance
5300 µS
Published table value
Data set 05
Published operating points and test conditions from this source.
Heater Warm-up Time (Average)
11 seconds
Heater Warm-up Time (Average) 11 11 seconds
Peak Heater-Cathode Voltage ±
100 volts
Peak Heater-Cathode Voltage ±100 max ±100 max volts
Plate Dissipation
1.5 watts
Plate Dissipation 1.5 watts
Plate Input
4 watts
Plate Input 4.B watts
Plate Dissipation
1.5 watts
Plate Dissipation 1.5 watts
Driving Power (Approx.)
0.35 watt
Driving Power (Approx.) 0.35 watt
Power Output (Approx.)
3.5 watts
Power Output (Approx.) 3.5 watts
Grid to Plate
1.6 pF
Grid to Plate 1.6 1.6 pF
Grid to Cathode and Heater
2.6 pF
Grid to Cathode and Heater 2.2 2.6 pF
Plate to Cathode and Heater (Unit No.l)
1.6 pF
Plate to Cathode and Heater (Unit No.l) ... 0.4 1.6 pF
Plate to Cathode and Heater (Unit No
1 pF
Plate to Cathode and Heater (Unit No.2) .... 0.4 1 pF
Grid No.l to Plate
0.49 pF
Grid No.l to Plate 0.49 pF
Grid No.l to Cathode, Heater. Grid No
9.5 pF
Grid No.l to Cathode, Heater. Grid No.2, and Grid No.3 9.5 pF
Plate to Cathode, Heater, Grid No
6.5 pF
Plate to Cathode, Heater, Grid No.2, and Grid No.3 . . 6.5 pF
Plate Voltage
300 volts
Plate Voltage 300 volts
Grid Voltage, Positive-bias value
0 volts
Grid Voltage, Positive-bias value 0 volts
Plate Voltage
100 volts
Plate Voltage 100 volts
Amplification Factor
38
Amplification Factor 38
Plate Resistance (Approx.)
7100 ohms
Plate Resistance (Approx.) 7100 ohms
Transconductance
5300
Transconductance 5300 /imhos
Plate Current
8.5 mA
Plate Current 8.5 mA
Plate Voltage
300 volts
Plate Voltage 300 volts
Grid Current
8 mA
Grid Current 8 mA
Plate Voltage
160 volts
Plate Voltage 160 volts
Grid Voltage"
-10 volts
Grid Voltage" -10 volts
Plate Current
30 mA
Plate Current 30 mA
Grid Current (Approx.)
16 mA
Grid Current (Approx.) 16 mA
Plate Voltage
250 volts
Plate Voltage 60 250 volts
Grid-No
250 volts
Grid-No.2 (Screen-Grid) Voltage 250 250 volts
Grid-No.l (Control-Grid) Voltage
-20 volts
Grid-No.l (Control-Grid) Voltage 0 -20 volts
Plate Resistance (Approx.)
50000 ohms
Plate Resistance (Approx.) 50000 ohms
Transconductance
4100
Transconductance 4100 ^mhos
Plate Current
43 mA
Plate Current 180- 43 mA
Grid-No
3.5 mA
Grid-No.2 Current 20- 3.5 mA