Voltage - Dual Triode (similar) ·Triode-Triode
6851
Bendix 6851 rugged high-mu miniature dual triode with hard-glass 300°C envelope, 6.3 V 250 mA heater and 10,000-hour rated life.
- Sections
- 2
- Base
- 9A
- Socket code
- B9A
- Base pins
- 9
- Nominal heater
- 6.3 V / 250 mA
Description
Miniature hard-glass high-mu double triode.
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
- 9A
- Socket code
- B9A
- Base pins
- 9
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 250 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
9A - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN12P | B | P — Plate (Anode) EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9A |
| PIN22G1 | B | G1 — Control Grid EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9A |
| PIN32K | B | K — Cathode EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9A |
| PIN4H | — | H — Heater EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9A |
| PIN5H | — | H — Heater EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9A |
| PIN61P | A | P — Plate (Anode) EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9A |
| PIN71G1 | A | G1 — Control Grid EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9A |
| PIN81K | A | K — Cathode EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9A |
| PIN9HCT | — | HCT — Heater Center Tap EIA transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 130, 9A |
Section ratings
2 physical sections, each with unique specifications.
Section 1
Triode
- Plate resistance
- 60000 Ω
- Transconductance
- 0.0012 S
- Amplification factor
- 70
- Max plate voltage
- 330 V
- Max plate dissipation
- 1 W
- Max cathode current
- 8 mA
Bendix 6851 TE-42 1957, physical triode section 1, separate cathode. Maximum plate 330 V, dissipation 1.0 W, cathode current 8 mA, grid circuit resistance 1 MΩ, heater-cathode 300 V. Typical Class A1 at heater 6.3 V, plate 250 V, cathode resistor 3100 Ω: Ia 1.0 mA, rp 60000 Ω, gm 0.0012 A/V, mu 70. Cgp 1.4 pF, input 1.6 pF, output 0.36 pF. Hard-glass bulb rated 300°C, 10000-hour life, 9A basing, pins 6 plate, 7 grid, 8 cathode.
Section 2
Triode
- Plate resistance
- 60000 Ω
- Transconductance
- 0.0012 S
- Amplification factor
- 70
- Max plate voltage
- 330 V
- Max plate dissipation
- 1 W
- Max cathode current
- 8 mA
Bendix 6851 TE-42 1957, physical triode section 2, separate cathode. Maximum plate 330 V, dissipation 1.0 W, cathode current 8 mA, grid circuit resistance 1 MΩ, heater-cathode 300 V. Typical Class A1 at heater 6.3 V, plate 250 V, cathode resistor 3100 Ω: Ia 1.0 mA, rp 60000 Ω, gm 0.0012 A/V, mu 70. Cgp 1.4 pF, input 1.6 pF, output 0.36 pF. Hard-glass bulb rated 300°C, 10000-hour life, 9A basing, pins 1 plate, 2 grid, 3 cathode.
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.