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Voltage Pentode - Sharp Cutoff (single) ·Pentode

6028

Sharp-cutoff pentode designed for RF, VHF/UHF, wide-band, or voltage-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: E7-1
Socket code: B7G
Base pins: 7
Nominal heater: 20 V / 50 mA

Description

The 6028 is a 7-pin sharp-cutoff pentode intended for RF applications requiring a high degree of reliability, long life and stable performance.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: E7-1
Socket code: B7G
Base pins: 7
Nominal heater voltage: 20 V
Nominal heater current: 50 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

E7-1 - 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 300000 Ω
Transconductance: 0.005 S
Max plate voltage: 180 V
Max screen voltage: 140 V
Max plate dissipation: 1.7 W
Max screen dissipation: 0.5 W
Max cathode current: 12 mA
Rectifier max heater-cathode voltage: 75 V

Promoted fields mapped from printed maximum-rating and characteristic headings; additional published values preserved in parameter rows.

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Input capacitance
4 pF
Output capacitance
2.8 pF
Grid-to-plate capacitance
0.02 pF

Other

Plate voltage
120 V
ClassA
Screen voltage
120 V
ClassA
Cathode resistor
180 ohm
ClassA
Plate current
7.5 mA
ClassA
Screen current
2.5 mA
ClassA
Plate resistance
300000 ohm
ClassA
Transconductance
5000 uS
ClassA

Data set 02

1965 Ericsson Longlife

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate supply voltage
120 V
ClassA
Screen-grid supply voltage
120 V
ClassA
Cathode bias resistor
200 Ohm
ClassA
Zero-signal plate current
7.5 mA
ClassA
Maximum-signal plate current
7.7 mA
ClassA
Zero-signal screen-grid current
1.9 mA
ClassA
Maximum-signal screen-grid current
2.7 mA
ClassA
Load resistance
15000 Ohm
ClassA
Power output
0.325 W
ClassA
Total harmonic distortion
12 %
ClassA
Transconductance minimum
3900 uS
Transconductance maximum
6000 uS

Characteristics

Transconductance
5000 uS
ClassA
Plate resistance
0.3 MOhm
ClassA
Screen-to-control-grid amplification factor
24 ratio
ClassA

Data set 03

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Grid 1 to plate capacitance maximum
0.02 pF
WholeTube
Input capacitance
3.9 pF
WholeTube
Output capacitance
2.85 pF
WholeTube

Other

Maximum plate voltage
200 V
WholeTube
Maximum grid 2 supply voltage
155 V
WholeTube
Maximum cathode current
20 mA
WholeTube
Maximum plate dissipation
1.85 W
WholeTube
Maximum grid 2 dissipation
0.55 W
WholeTube
Maximum heater-cathode voltage
75 V
WholeTube
Plate supply voltage
120 V
ClassA1
Grid 2 supply voltage
120 V
ClassA1
Cathode resistor
200 ohm
ClassA1
Grid 1 voltage
0 V
ClassA1
Plate current
7 mA
ClassA1
Grid 2 current
2.25 mA
ClassA1
Transconductance
4950 uS
ClassA1
Plate resistance
340000 ohm
ClassA1

Data set 04

196X LM Ericsson

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
20 V
Heater current
50 mA
Plate resistance
1600 ohm
Transconductance
125 uS
Amplification factor
2

Other

Maximum plate voltage
200 V
Maximum screen voltage
155 V
Maximum plate dissipation
1.85 W

Data set 05

2026 Western Electric 400s

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate Current ., , Eb = Eg
120 milliamperes
Plate Current ., , Eb = Eg2 ~ 120 volis; . 7.5 milliamperes
Transconductance . Cathode-Bias Resistor =
200 micromhos
Transconductance . Cathode-Bias Resistor = 200 chms { 5000 micromhos
Heafer Voltage, A-C or D-C . . . . . & . &« v v o v « «
20 volts
Heafer Voltage, A-C or D-C . . . . . & . &« v v o v « « . 20 volts
Cathode Current ., . . « & & & v v
4 milliamperes
Cathode Current ., . . « & & & v v 4 4 4 v o 4 e e v a 12 milliamperes
Heater-Cathkode Voltagel e e e e e e e e e e e e e e
120 volts
Heater-Cathkode Voltagel e e e e e e e e e e e e e e 120 volts
Transconductance . « o o o o = + « s o ¢ » o <
5000 micromhos
Transconductance . « o o o o = + « s o ¢ » o < 5000 5600 micromhos
Load Resistance . . . « . v ¢ ¢« « = & o s s =«
15000 ohms
Load Resistance . . . « . v ¢ ¢« « = & o s s =« 15000 15C00 ohms
Total Harmonis Distortion . + - + o « o s o <
12 per cent
Total Harmonis Distortion . + - + o « o s o < 12 5.5 per cent
Plcte Current of
10 volts
Plcte Current of 10 Microampares . . . . « - -6.8 -6.8 volts
voltage should not exceed
90 volts
voltage should not exceed 90 volts.
SCREEN GRID VOLTAGE=
120 VOLTS
SCREEN GRID VOLTAGE=120 VOLTS
|SCREEN GRID VOLTAGE=
120 VOLTS
- |SCREEN GRID VOLTAGE=120 VOLTS

Other

Plate Dissipation . . & . v v v ¢ o v
4 watts
Plate Dissipation . . & . v v v ¢ o v 4 @ ¢ 4 e e e e 1.7 watts