6928

Power/output pentode designed for audio, broadband, telephone, industrial, or general power-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: E7-1
Socket code: B7G
Base pins: 7
Nominal heater: 6.3 V / 360 mA

Description

Long-life, low-failure-rate power amplifier pentode for dependable medium-power applications.

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: 6.3 V
Nominal heater current: 360 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: 80000 Ω
Transconductance: 0.0039 S
Amplification factor: 10
Max plate voltage: 200 V
Max screen voltage: 200 V
Max plate dissipation: 8 W
Max screen dissipation: 1 W

Published ratings and characteristics audited; additional numerical data 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

1960 Ericsson

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

The
6928 W
The 6928 is intended for use in medium power applications, where very
Published value [1]
1
1. Grid No 1 -« 3
Published value [2]
1
1. Grid No 1 -« 3
Published value [3]
3
1. Grid No 1 -« 3
Published value [1]
2
2. Cathode and Grid No 3 i
Published value [2]
3
2. Cathode and Grid No 3 i
Published value
3
3. Heater =
Published value
4
4. Heater
Published value
5
5. Plate
Published value [1]
60
60 Grid No 2 BOTTON YIBV
Published value [2]
2
60 Grid No 2 BOTTON YIBV
Published value [1]
7
7. Grid No 1
Published value [2]
1
7. Grid No 1
Grid Nol to Plate . . . « [1]
0.17
Grid Nol to Plate . . . « . . . . 0.17 0. 35 uuF
Grid Nol to Plate . . . « [2]
0
Grid Nol to Plate . . . « . . . . 0.17 0. 35 uuF
Grid Nol to Plate . . . « [3]
35
Grid Nol to Plate . . . « . . . . 0.17 0. 35 uuF
Input . . . . . .+ . v . e e e [1]
8
Input . . . . . .+ . v . e e e 8.0 7.6 uuF
Input . . . . . .+ . v . e e e [2]
7.6
Input . . . . . .+ . v . e e e 8.0 7.6 uuF
Grid No [1]
1
Grid No 1 to Plate . - 0.17 0. 35 uuF
Grid No [2]
0.17
Grid No 1 to Plate . - 0.17 0. 35 uuF
Grid No [3]
0
Grid No 1 to Plate . - 0.17 0. 35 uuF
Grid No [4]
35
Grid No 1 to Plate . - 0.17 0. 35 uuF
Input [1]
6.4
Input . 6.4 8.0 9.6 uuF
Input [2]
8
Input . 6.4 8.0 9.6 uuF
Input [3]
9.6
Input . 6.4 8.0 9.6 uuF
Plate Voltage
200 V
Plate Voltage . . . . . . . . . . . . .. 200 volts
Grid No [1]
2 V
Grid No 2 Voltage . . . . . . . . . . . . 200 volts
Grid No [2]
200 V
Grid No 2 Voltage . . . . . . . . . . . . 200 volts
Plate Dissipation . . ., . .,
8 W
Plate Dissipation . . ., . ., . . . . . . . 8 watts
Grid No [1]
2 W
Grid No 2 Dissipation . . . . . . . . . . 1 watt
Grid No [2]
1 W
Grid No 2 Dissipation . . . . . . . . . . 1 watt
Heater - Cathode Voltage . . . v e e
90 V
Heater - Cathode Voltage . . . v e e . 90 volts
Bulb Temperature (at hottest pmnt) e e
200
Bulb Temperature (at hottest pmnt) e e 200 °c
Grid No [1]
1 Mohm
Grid No 1 Circuit Resistance . . . . . . . 0.5 megohm
Grid No [2]
0.5 Mohm
Grid No 1 Circuit Resistance . . . . . . . 0.5 megohm
Heater Vo]‘tage**. e e e e [1]
6.375
Heater Vo]‘tage**. e e e e 6.375% 6.325% volts
Heater Vo]‘tage**. e e e e [2]
6.325
Heater Vo]‘tage**. e e e e 6.375% 6.325% volts
Heater Current [1]
0 mA
Heater Current . . . . . . . . . . 0. 360 0. 360 amp
Heater Current [2]
360 A
Heater Current . . . . . . . . . . 0. 360 0. 360 amp
Heater Current [3]
0 mA
Heater Current . . . . . . . . . . 0. 360 0. 360 amp
Heater Current [4]
360 A
Heater Current . . . . . . . . . . 0. 360 0. 360 amp
Plate Supply Voltage [1]
130 V
Plate Supply Voltage . . . . . . . . 130 180 volts
Plate Supply Voltage [2]
180 V
Plate Supply Voltage . . . . . . . . 130 180 volts
Grid No [1]
2 V
Grid No 2 Supply Voltage . . . . . ., 130 180 volts
Grid No [2]
130 V
Grid No 2 Supply Voltage . . . . . ., 130 180 volts
Grid No [3]
180 V
Grid No 2 Supply Voltage . . . . . ., 130 180 volts
Cathode Bias Resistor . . ., [1]
200 ohm
Cathode Bias Resistor . . ., . . . . 200 220 chms
Cathode Bias Resistor . . ., [2]
220 ohm
Cathode Bias Resistor . . ., . . . . 200 220 chms
Plate Current [1]
23 mA
Plate Current . . . . . . . . . . . 23 32.5 milliamps
Plate Current [2]
32.5 mA
Plate Current . . . . . . . . . . . 23 32.5 milliamps
Grid No [1]
2 mA
Grid No 2 Current . . . . . . . . . 2 3 milliamps
Grid No [2]
2 mA
Grid No 2 Current . . . . . . . . . 2 3 milliamps
Grid No [3]
3 mA
Grid No 2 Current . . . . . . . . . 2 3 milliamps
Plate Resistance ., [1]
80 ohm
Plate Resistance ., . . . . . . . . 80, 000 80,000 ohms
Plate Resistance ., [2]
0 ohm
Plate Resistance ., . . . . . . . . 80, 000 80,000 ohms
Plate Resistance ., [3]
80000 ohm
Plate Resistance ., . . . . . . . . 80, 000 80,000 ohms
Transconductance [1]
3400 uS
Transconductance . . . 3400 3900 umhos
Transconductance [2]
3900 uS
Transconductance . . . 3400 3900 umhos
Load Resistance , . . . . . . « [1]
6000 ohm
Load Resistance , . . . . . . « . . 6000 6000 ohms
Load Resistance , . . . . . . « [2]
6000 ohm
Load Resistance , . . . . . . « . . 6000 6000 ohms
Power Qutput ., [1]
1 W
Power Qutput ., . . . . . . . . . . 1.0 2.1 watts
Power Qutput ., [2]
2.1 W
Power Qutput ., . . . . . . . . . . 1.0 2.1 watts
Total Distortion [1]
7
Total Distortion . . . . . . . . . . 7 8 %
Total Distortion [2]
8
Total Distortion . . . . . . . . . . 7 8 %
Heater Voltage . . . . . . . . «
6.3 V
Heater Voltage . . . . . . . . « . . . 6.3 volts
Plate Supply Voltage
130 V
Plate Supply Voltage . . . . . . . . . . 130 volts
Grid No [1]
2 V
Grid No 2 Supply Voltage . . . . . . . . 130 volts
Grid No [2]
130 V
Grid No 2 Supply Voltage . . . . . . . . 130 volts
Cathode Bias Resistor
200 ohm
Cathode Bias Resistor . . . . . . . . . 200 chms
Heater Current [1]
320 mA
Heater Current . . . . . . . . . . 320 360 400 milliamps
Heater Current [2]
360 mA
Heater Current . . . . . . . . . . 320 360 400 milliamps
Heater Current [3]
400 mA
Heater Current . . . . . . . . . . 320 360 400 milliamps
Plate Current e e e e [1]
16 mA
Plate Current e e e e 16 23 30 milliamps
Plate Current e e e e [2]
23 mA
Plate Current e e e e 16 23 30 milliamps
Plate Current e e e e [3]
30 mA
Plate Current e e e e 16 23 30 milliamps

Data set 02

1965 Ericsson Longlife

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate supply voltage
130 V
ClassA
Screen-grid supply voltage
130 V
ClassA
Cathode bias resistor
200 Ohm
ClassA
Plate current
23 mA
ClassA
Screen-grid current
2 mA
ClassA
Load resistance
6000 Ohm
ClassA
Power output
1 W
ClassA
Total harmonic distortion
7 %
ClassA
Plate supply voltage
180 V
ClassA
Screen-grid supply voltage
180 V
ClassA
Plate current
32.5 mA
ClassA
Load resistance
8000 Ohm
ClassA;Va=180V
Power output
2.1 W
ClassA;Va=180V
Transconductance minimum
2600 uS
Transconductance maximum
4200 uS

Characteristics

Transconductance
3400 uS
ClassA
Plate resistance
0.08 MOhm
ClassA
Transconductance
3900 uS
ClassA;Va=180V

Data set 03

196X LM Ericsson

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
6.3 V
Heater current
360 mA
Plate resistance
200 ohm
Amplification factor
2

Other

Maximum plate voltage
220 V
Maximum screen voltage
220 V
Maximum plate dissipation
9 W