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51

Tetrode documented in Raytheon receiving-tube sources. Available manufacturer material in the current record does not establish a narrower functional application confidently enough for recategorization.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 5E
Socket code: UX5
Base pins: 5
Nominal heater: 2.5 V / 1.75 A

Description

51 is documented by Raytheon as a Tetrode device. Remote-cutoff tetrode high-frequency amplifier/mixer. Published ratings, characteristics, capacitances, and representative operating conditions were preserved where applicable.

Socket description

Small 5-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 5E
Socket code: UX5
Base pins: 5
Nominal heater voltage: 2.5 V
Nominal heater current: 1.75 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

5E - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances

Plate resistance: 400000 Ω
Transconductance: 0.00105 S
Max plate voltage: 275 V
Max screen voltage: 90 V

Promoted from clearly identified printed ratings/characteristics; additional published operating points and capacitances retained in TUBE_SECTION_PARAMETER.

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 01

1937 Raytheon Radio Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Capacitance

Grid-to-plate capacitance
- to 0.007 pF
WithTubeShield; Maximum
Input capacitance
5 pF
Output capacitance
10.5 pF

Other

Plate voltage
180 V
ClassA
Screen voltage
90 V
ClassA; PlateVoltage=180V
Grid bias
-3 V
ClassA; PlateVoltage=180V
Plate current
6.3 mA
ClassA; PlateVoltage=180V
Screen current
2.5 mA
ClassA; PlateVoltage=180V
Plate voltage
250 V
ClassA
Screen voltage
90 V
ClassA; PlateVoltage=250V
Grid bias
-3 V
ClassA; PlateVoltage=250V
Plate current
6.5 mA
ClassA; PlateVoltage=250V
Screen current
2.5 mA
ClassA; PlateVoltage=250V
Grid bias
-7 V
Mixer; Superheterodyne

Characteristic

Amplification factor
305
ClassA; PlateVoltage=180V
Plate resistance
0.3 MOhm
ClassA; PlateVoltage=180V
Transconductance
1020 uS
ClassA; PlateVoltage=180V
Amplification factor
420
ClassA; PlateVoltage=250V
Plate resistance
0.4 MOhm
ClassA; PlateVoltage=250V
Transconductance
1050 uS
ClassA; PlateVoltage=250V

Data set 02

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristics

Heater or filament voltage
2.5 V
Published nominal value
Heater or filament current
1.75 A
Published nominal value
Transconductance
1050 µS
Published representative/high operating value
Amplification factor
420
Published representative/high operating value
Plate resistance
400000 ohm
Published representative/high operating value
Remote-cutoff transconductance
15 µS
At -40 V bias

Other

Application
RF amplifier; IF amplifier; mixer
Type 35 source states interchangeability

Data set 03

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Maximum plate voltage
275 V
Published handbook rating
Maximum screen voltage
90 V
Published handbook rating
Plate voltage
250 V
ClassA
Screen voltage
90 V
ClassA
Control-grid bias
3 V
ClassA
Plate current
6.5 mA
ClassA
Screen current
2.5 mA
ClassA

Characteristic

Plate resistance
400000 ohm
Published handbook characteristic
Transconductance
1050 µS
Published handbook characteristic
Heater/filament voltage
2.5 V
Published heater/filament rating
Heater/filament current
1.75 A
Published heater/filament rating