Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 2
Pentode
Other
PlateVoltageTypical
170 V
Published operating/characteristic value
Voltage Triode Pentode ·Pentode-Triode
6GD7
Triode-pentode designed for VHF oscillator and mixer service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- 9GF
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 6.3 V / 380 mA
Description
Medium-mu triode and sharp-cutoff pentode designed primarily for VHF oscillator and mixer service.
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
- 9GF
- Socket code
- B9A
- Base pins
- 9
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 380 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
9GF - 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, 9GF |
| PIN2Base Pin | B | P — Plate (Anode) Literal label 2P; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GF |
| PIN3Base Pin | A | G3 — Suppressor GridGroup 9GF3 Literal label 1G3; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GF |
| PIN3Base Pin | — | K — CathodeGroup 9GF3 Literal label K; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GF |
| PIN4Base Pin | — | H — Heater Literal label H; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GF |
| PIN5Base Pin | — | H — Heater Literal label H; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GF |
| PIN6Base Pin | A | P — Plate (Anode) Literal label 1P; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GF |
| PIN7Base Pin | A | G2 — Screen Grid Literal label 1G2; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GF |
| PIN8Base Pin | A | G3 — Suppressor GridGroup 9GF8 Literal label 1G3; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GF |
| PIN8Base Pin | — | K — CathodeGroup 9GF8 Literal label K; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GF |
| PIN9Base Pin | A | G1 — Control Grid Literal label 1G1; manufacturer confirmation pending | Unverified EIA Base Connections printed p132, 9GF |
Section ratings
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 4700 Ω
- Transconductance
- 0.01 S
- Max plate voltage
- 125 V
- Max plate dissipation
- 1.7 W
Sylvania 6GD7 medium-mu TRI ODE local-oscillator section in dissimilar nine-pin 9GF triode-pentode VHF frequency changer. Tube heater 6.3 V 0.380 A, source classifies triode oscillator and sharp-cutoff pentode mixer. Design maximum triode plate voltage 125 V, dissipation 1.7 W. Typical triode at plate 125 V, control grid approx -1 V: transconductance 10,000 µmhos (0.010 S), plate resistance approximately 4700 Ω, triode amplification factor around 47. Published unshielded triode grid-plate ~2.3 pF, input 3.0 pF, output 1.2 pF and cross-section couplings. The triode is one physical section, not an additional control grid of pentode.
Section 2
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 350000 Ω
- Transconductance
- 0.012 S
- Max plate voltage
- 250 V
- Max plate dissipation
- 2.7 W
- Max cathode current
- 20 mA
Sylvania 6GD7 sharp-cutoff PENTODE VHF mixer section, separate from its medium-mu triode oscillator. Design maximum pentode plate voltage 250 V, plate dissipation 2.7 W and cathode current 20 mA. Screen-grid supply max 250 V must NOT be entered as unconditional max_screen_voltage: actual permissible screen voltage and screen dissipation follow manufacturer rating chart; max_screen_voltage cleared as approved, max_screen_dissipation NULL. Typical at Va 170 V, Vg2 150 V, grid-1 0 V, cathode resistor 82 Ω: plate 10 mA, screen ~3.3 mA, gm 12000 µmhos (0.012 S), approximate plate resistance 350 kΩ, grid1-to-grid2 amplification factor 70 (not overall pentode mu). Unshielded capacitances grid-to-plate max 0.025 pF, input ~6.4 pF, output 3.5 pF; source specifies tight control-grid/cathode spacing and test-voltage cautions.
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.