Voltage - Triode (single high frequency) ·Triode
UHF television-service triode for amplifier and oscillator applications in television tuner circuits.
UHF television-service triode for amplifier and oscillator applications.
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 |
|---|---|---|---|
| PIN1P | A | P — Plate (Anode) Source-transcribed; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 7DK |
| PIN2G1 | A | G1 — Control Grid Source-transcribed; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 7DK |
| PIN3H | — | H — Heater Source-transcribed; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 7DK |
| PIN4H | — | H — Heater Source-transcribed; independent manufacturer verification pending | Unverified EIA Base Connections, printed page 129, 7DK |
| PIN5K | A | K — Cathode Chart transcription; independent verification pending | Unverified EIA Base Connections, printed page 129, 7DK |
| PIN6G1 | A | G1 — Control Grid Chart transcription; independent verification pending | Unverified EIA Base Connections, printed page 129, 7DK |
| PIN7P | A | P — Plate (Anode) Chart transcription; independent verification pending | Unverified EIA Base Connections, printed page 129, 7DK |
1 physical section, each with unique specifications.
Section 1
UHF oscillator ratings.
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.
Grid to plate capacitance
1.9 pF
Grid to cathode and heater capacitance
2.2 pF
Plate voltage
150 V
UHFOscillator
Plate dissipation
2.5 W
UHFOscillator
Plate voltage
80 V
UHFOscillator
Transconductance
6500 uS
UHFOscillator
Amplification factor
13.5
UHFOscillator
Plate resistance
2100 ohm
UHFOscillator
Data set 02
Published operating points and test conditions from this source.
NECTIONS TO THE PLATE AND GRID. ELECTRICALLY. THE
3 A
Oscillator | NECTIONS TO THE PLATE AND GRID. ELECTRICALLY. THE 3AF4 IS IDENTICAL TO THE 3A F4A
NECTIONS TO THE PLATE AND GRID. ELECTRICALLY. THE
4 A
Oscillator | NECTIONS TO THE PLATE AND GRID. ELECTRICALLY. THE 3AF4 IS IDENTICAL TO THE 3A F4A
PLATE VOLTAGE
150 V
Oscillator | PLATE VOLTAGE 150 VOLTS
NEGATIVE GRID VOLTAGE
50 V
Oscillator | NEGATIVE GRID VOLTAGE 50 VOLTS
PLATE DISSIPATION
2.5 W
Oscillator | PLATE DISSIPATION 2.5 WATTS
GRID CURRENT
2 mA
Oscillator | GRID CURRENT 2 mA
CATHODE CURRENT
24 mA
Oscillator | CATHODE CURRENT 24 mA
GRID TO PLATE
1.9 pF
Capacitances | GRID TO PLATE 1.9 pf
GRID TO CATHODE AND HEATER
2.2 pF
Capacitances | GRID TO CATHODE AND HEATER 2.2 pf
'LATE TO CATHODE AND HEATER
1.4 pF
Capacitances | :'LATE TO CATHODE AND HEATER 1.4 pf
HEATER WARM-UP TIME
11 s
Capacitances | HEATER WARM-UP TIME 11 SECONDS
LIMITS OF SUPPLIED CURRENT
30 mA
Capacitances | LIMITS OF SUPPLIED CURRENT 450 * 30 mA
HEATER NEGATIVE WITH RESPECT TO CATHODE
50 V
Capacitances | HEATER NEGATIVE WITH RESPECT TO CATHODE 50 VOLTS
HEATER POSITIVE WITH RESPECT TO CATHODE
50 V
Capacitances | HEATER POSITIVE WITH RESPECT TO CATHODE 50 VOLTS
PLATE VOLTAGE
80 V
ClassA | PLATE VOLTAGE 80 VOLTS
CATHODE RESISTOR
150 ohm
ClassA | CATHODE RESISTOR 150 OHMS
PLATE CURRENT
17.5 mA
ClassA | PLATE CURRENT 17.5 mA
PLATE RESISTANCE APPRO X
2.1 ohm
ClassA | PLATE RESISTANCE APPRO X. 2.100 OHMS
PLATE VOLTAGE
100 V
ClassA | PLATE VOLTAGE 100 VOLTS
GRID RESISTOR
10 ohm
ClassA | GRID RESISTOR 10.000 OHMS
PLATE CURRENT
17 mA
ClassA | PLATE CURRENT 17 mA