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EL91

Output pentode rated for approximately 4 W anode dissipation and suitable for RF or AF amplification. Its compact construction supports both radio-frequency and low-frequency power service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B7G
Base pins: 7
Nominal heater: 6.3 V / 200 mA

Description

OUTPUT PENTODE Output pentode rated for 4W anode dissipation suitable for use as an r.f. or a.f. amplifier. EL91

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B7G
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 200 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

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: 130000 Ω
Transconductance: 0.0026 S
Amplification factor: 12
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 4 W
Max screen dissipation: 0.6 W

Published ratings/characteristics promoted where clearly stated; repeated identical rectifier sections compressed to one section row.

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

1951 Mullard Valve and Service Manual

Published operating points and test conditions from this source.

SECTION 1

Pentode

Application

Service
Audio power output

Data set 02

1953 La Radiotechnique

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
6.3 V
Published nominal value
Heater current
200 mA
Published nominal value
Transconductance
2600 µS
Published typical/nominal value
Warm-up time
12 s
Published

Data set 03

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

HeaterOrFilamentVoltage
6.3 V
HeaterOrFilamentCurrent
200 mA
Input Capacitance
4.2 pF
Output Capacitance
3.2 pF
PlateToGridCapacitanceMax
0.5 pF
Transconductance
2.6 mA/V

Other

Plate Voltage
250 V
ClassA
Screen Voltage
250 V
ClassA
Plate Current
16 mA
ClassA
Screen Current
2.4 mA
ClassA
Load Resistance
16 kohm
ClassA
Power Output
1.4 W
ClassA

Data set 04

1963 Philips Electron Tubes Handbook V1a

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Plate voltage
250 V
Screen voltage
250 V
Plate current
16 mA
Screen current
2.4 mA
Transconductance
2600 uS
Amplification factor grid2/grid1
12
Plate resistance
130 kOhm

Capacitance

Grid capacitance without external shield
4 pF
Grid capacitance with external shield
6.6 pF
Plate capacitance without external shield
3.75 pF
Plate capacitance with external shield
4 pF
Grid-to-plate capacitance
- to 0.25 pF
Maximum

Other

Cathode resistor
740 ohm
ClassA
Load resistance
16 kOhm
ClassA
Grid drive at 10 percent distortion
5.3 V RMS
ClassA
Power output at 10 percent distortion
1.4 W
ClassA
Cathode resistor
600 ohm
ClassAB; PushPull; TwoTubes
Load resistance plate-to-plate
24 kOhm
ClassAB; PushPull; TwoTubes
Power output
4 W
ClassAB; PushPull; TwoTubes

Data set 05

1967 Mullard Receiving Tubes for Maintenance

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Output pentode rated for
4
Characteristic
Va
250 V
Characteristic
Vg3
0 V
Characteristic
Vg
250 V
Characteristic
Vg
5 V
Characteristic
gm
2.5 mA
Characteristic
Vg
-13.5 V
Characteristic
gm
2.7 mA
Characteristic

Capacitance

Cin
3.8 pF
Characteristic

Other

Va - k
250 V
OPERATING CONDITIONS AS SINGLE VALVE AMPLI FIER
Vg
250 V
OPERATING CONDITIONS AS SINGLE VALVE AMPLI FIER
Ra
18
OPERATING CONDITIONS AS SINGLE VALVE AMPLI FIER
OPE RATI NG C O N D IT IONS FOR
2
OPERATING CONDITIONS AS SINGLE VALVE AMPLI FIER
Rk (per valve)
820
OPERATING CONDITIONS AS SINGLE VALVE AMPLI FIER
screen-gr id currents. This w ill re su lt in app ro x imate ly
10 w
OPERATING CONDITIONS AS SINGLE VALVE AMPLI FIER
Va
250 V
OPERATING CONDITIONS AS R.F. AMPLIFIER
Vg2 ( lJ )
250 V
OPERATING CONDITIONS AS R.F. AMPLIFIER
Vg
-14 V
OPERATING CONDITIONS AS R.F. AMPLIFIER
Vg
250 V
OPERATING CONDITIONS AS FREQUENCY DOUBLER
Va
250 V
OPERATING CONDITIONS AS FREQUENCY TREBLER
Vg
-75 V
OPERATING CONDITIONS AS FREQUENCY TREBLER
Va(l» ) max
550 V
OPERATING CONDITIONS AS FREQUENCY TREBLER
Va max
250 V
OPERATING CONDITIONS AS FREQUENCY TREBLER
Vg
550 V
OPERATING CONDITIONS AS FREQUENCY TREBLER
Vg
250 V
OPERATING CONDITIONS AS FREQUENCY TREBLER
Vg
100 V
OPERATING CONDITIONS AS FREQUENCY TREBLER
Vg l (V)
0 V
OPERATING CONDITIONS AS FREQUENCY TREBLER
VOL TA GE WITH CON T ROL-G RID VOLTAGE AS PARAMETER. V g
150 V
OPERATING CONDITIONS AS FREQUENCY TREBLER
Vg2
-200 V
OPERATING CONDITIONS AS FREQUENCY TREBLER
VOLTAGE W ITH CO NT ROL-G RID VOLTA GE AS PARAMETER. Vg2 =
200 W
OPERATING CONDITIONS AS FREQUENCY TREBLER
VO LTAGE WITH CO NT RO L-GRID VOL TAG E AS PARAMETER. Vg
250
OPERATING CONDITIONS AS FREQUENCY TREBLER
Va = V"
150 V
OPERATING CONDITIONS AS FREQUENCY TREBLER
Va = Vg
0
OPERATING CONDITIONS AS FREQUENCY TREBLER
Va = V g
250 V
OPERATING CONDITIONS AS FREQUENCY TREBLER

Data set 06

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Typical plate voltage
250 V
Typical plate current
16 mA
Typical screen current
2.4 mA

Characteristic

Screen-to-grid amplification factor
12