Voltage Triode Pentode ·Pentode-Triode
10LB8
Frame-grid sharp-cutoff pentode combined with a medium-mu triode for television video-amplifier service.
- Sections
- 2
- Base
- 9DX
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 10.2 V / 450 mA
Description
Frame-grid sharp-cutoff pentode combined with a medium-mu triode for video-amplifier 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
- 9DX
- Socket code
- B9A
- Base pins
- 9
- Nominal heater voltage
- 10.2 V
- Nominal heater current
- 450 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- Yes
9DX - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN12K | B | K — Cathode EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9DX |
| PIN22G1 | B | G1 — Control Grid EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9DX |
| PIN32P | B | P — Plate (Anode) EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9DX |
| PIN4H | — | H — Heater EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9DX |
| PIN5H | — | H — Heater EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9DX |
| PIN61G3 | A | G3 — Suppressor GridGroup 9DX6 EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9DX |
| PIN6IS | A | IS — Internal ScreenGroup 9DX6 EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9DX |
| PIN61K | A | K — CathodeGroup 9DX6 EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9DX |
| PIN71G1 | A | G1 — Control Grid EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9DX |
| PIN81G2 | A | G2 — Screen Grid EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9DX |
| PIN91P | A | P — Plate (Anode) EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 131, 9DX |
Section ratings
2 physical sections, each with unique specifications.
Section 1
Triode
- Plate resistance
- 6000 Ω
- Transconductance
- 0.005 S
- Amplification factor
- 30
- Max plate voltage
- 330 V
- Max plate dissipation
- 2 W
RCA/Sylvania 10LB8 medium-mu voltage-amplifier triode. Typical Va 125 V, cathode resistor 68 ohms, gm 5 mA/V, mu 30, plate resistance 6 kΩ, plate current 13 mA. Max plate 330 V, dissipation 2 W. Combined dissipation of triode and video pentode anodes must not exceed 5 W, despite individual 2 W and 4 W ratings. 10.2 V 0.45 A series heater, interelectrode capacitances published.
Section 2
Pentode
- Plate resistance
- 50000 Ω
- Transconductance
- 0.02 S
- Max plate voltage
- 330 V
- Max plate dissipation
- 4 W
- Max screen dissipation
- 1.1 W
RCA/Sylvania 10LB8 sharp-cutoff frame-grid TV video pentode. Typical plate 200 V, screen 100 V, cathode resistor 82 ohms, plate current 17 mA, gm 20 mA/V, plate resistance ~50 kΩ. Max plate 330 V and dissipation 4 W. Screen dissipation 1.1 W up to 165 V screen, other conditions per rating chart. Sum of triode and pentode plate dissipations must not exceed 5 W. Published interelectrode capacitances.
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.