Data set 01
1938 National Union
Published operating points and test conditions from this source.
SECTION 1
Beam Power
Characteristics
Filament voltage series
2.5 V
Center-tapped filament
Filament voltage parallel
1.25 V
Center-tapped filament
Power - Beam Single (NOT sweep) (under 10W) ·BeamPower
5851
Beam-power tube documented by National Union and GE literature; available source material establishes its power construction but does not clearly support a narrower specialized application.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 6CL
- Socket code
- -
- Base pins
- 6
- Nominal heater
- 2.5 V / 55 mA
Description
National Union 5851 beampower vacuum tube described in the approved datasheet for its stated amplifier, rectifier, indicator, or specialized electronic service.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 6CL
- Socket code
- -
- Base pins
- 6
- Nominal heater voltage
- 2.5 V
- Nominal heater current
- 55 mA
- Parallel heater voltage
- 1.25 V
- Parallel heater current
- 110 mA
- Series capable
- Yes
6CL - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1F | — | F — Filament Chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 6CL |
| PIN3P | A | P — Plate (Anode) Chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 6CL |
| PIN5G3 | A | G3 — Suppressor GridGroup 6CL5 Chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 6CL |
| PIN5FCT | — | FCT — Filament Center TapGroup 6CL5 Chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 6CL |
| PIN6G2 | A | G2 — Screen Grid Chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 6CL |
| PIN7F | — | F — Filament Chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 6CL |
| PIN8G1 | A | G1 — Control Grid Chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 6CL |
Section ratings
1 physical section, each with unique specifications.
Section 1
Beam Power
X-ray radiationInterelectrode capacitances
- Plate resistance
- 175000 Ω
- Transconductance
- 0.0016 S
- Max plate voltage
- 180 V
- Max screen voltage
- 135 V
- Max plate dissipation
- 1.5 W
- Max cathode current
- 12 mA
Promoted ratings/characteristics read from the approved National Union datasheet.
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.
Data set 02
195X General Electric Essential Characteristics
Published operating points and test conditions from this source.
SECTION 1
Beam Power
Capacitance
Input capacitance
2.5 pF
Section1
Output capacitance
3 pF
Section1
Grid-to-plate capacitance
0.055 pF
Section1
Other
Plate voltage
125 V
ClassA
Screen voltage
125 V
ClassA
Control-grid voltage
-7.5 V
ClassA
Plate current
5.5 mA
ClassA
Screen current
0.9 mA
ClassA
Characteristic
Plate resistance
175000 Ω
ClassA
Transconductance
1600 µS
ClassA