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
Power - Pentode Single (NOT beam) (under 10W) ·Pentode
EL41
High-sensitivity receiving power pentode for audio-frequency loudspeaker output.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- B8A
- Socket code
- B8A
- Base pins
- 8
- Nominal heater
- 6.3 V / 710 mA
Description
Power pentode for AF output amplification. Indirectly heated Mazda/Belvu receiving tube; descriptive text translated to English from the French source.
Socket description
Rimlock 8-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- B8A
- Socket code
- B8A
- Base pins
- 8
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 710 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
B8A - 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
- 40000 Ω
- Transconductance
- 0.01 S
- Amplification factor
- 400
- Max plate voltage
- 300 V
- Max screen voltage
- 300 V
- Max plate dissipation
- 9 W
- Max screen dissipation
- 3.3 W
- Max cathode current
- 55 mA
Published ratings/characteristics promoted from the approved source.
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
1953 La Radiotechnique
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
710 mA
Nominal
Maximum Plate Voltage
300 V
Maximum Screen Voltage
300 V
Maximum Plate Dissipation
9 W
Characteristic
Transconductance
10000 µS
Typical
Amplification Factor
400
Typical
Plate Resistance
40000 ohm
Typical
Data set 03
1958 Brimar Radio Valve No 7
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Heater Voltage
6.3 V
Heater Current
700 mA
Other
Plate Voltage
250 V
ClassA
Plate Current
36 mA
ClassA
Power Output
4.2 W
ClassA
Data set 04
1963 Mullard
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Anode current
36 mA
Va=250V; Vg2=250V
Screen current
5.2 mA
Va=250V; Vg2=250V
Other
Output power
4.2 W
ClassA; Pentode
Push-pull output power
13 W
PushPull; TwoTubes
Data set 05
1963 Philips Electron Tubes Handbook V1a
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Heater voltage
6.3 V
Published heater rating
Heater current
710 mA
Published heater rating
Transconductance
10000 µS
ClassA
Plate resistance
40000 ohm
ClassA
Other
Plate voltage
250 V
ClassA
Screen voltage
250 V
ClassA
Plate current
36 mA
ClassA
Screen current
5.2 mA
ClassA
Load resistance
7000 ohm
ClassA
Power output
3.9 W
ClassA
Push-pull power output
9.4 W
ClassAB PushPull TwoTubes
Data set 06
1967 Mullard Receiving Tubes for Maintenance
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Output pentode rated for
9
Characteristic
Va
250 V
CHARACTERISTICS
Vg
250 V
CHARACTERISTICS
Vg I
-7 V
CHARACTERISTICS
gm
10 mA
CHARACTERISTICS
Other
Va
250 V
OPERATING CONDITIONS AS SINGLE VALVE CLASS " A"
Vg
250 V
OPERATING CONDITIONS AS SINGLE VALVE CLASS " A"
Vg I
-7 V
OPERATING CONDITIONS AS SINGLE VALVE CLASS " A"
Ra
7
OPERATING CONDITIONS AS SINGLE VALVE CLASS " A"
Ra
3.5
OPERATING CONDITIONS AS SINGLE VALVE CLASS " A"
Output pentode rated for
9
OPERATING CONDITIONS AS SINGLE VALVE CLASS " A"
Vg Z
300 V
OPERATING CONDITIONS AS SINGLE VALVE CLASS " A"
D Ia l
1
OPERATING CONDITIONS AS SINGLE VALVE CLASS " A"
Vg • ( b ) max
550 V
OPERATING CONDITIONS AS SINGLE VALVE CLASS " A"
Vg • max
300 V
OPERATING CONDITIONS AS SINGLE VALVE CLASS " A"
Vg1 max. (lg1 =
3 V
OPERATING CONDITIONS AS SINGLE VALVE CLASS " A"
EL4
9
OPERATING CONDITIONS AS SINGLE VALVE CLASS " A"
Data set 07
1968 Mazda Belvu
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Tension filament … … Vf
6.3 V
Courant filament … … If
710 mA
Capacité anode/ grille n° 1 ……s C@/ B1
1 pF
Capacité grille n° 1/ filament …… C8,/f
0.15 pF
Tension d'anode à courant nul … … Vabl
550 V
Tension d’anode ….……..….………. … Va
300 V
Tension de grille n° 2 à courant nul …… Vebl
550 V
Tension de grille n°2 … VeE,
300 V
à signal nul ….....….….…crorererecorrensersensencerrcerrse… P82 SIZO
1.4 W
e ienenees PBOSigMax
3.3 W
Tension entre filament et cathode …… VfK
100 V
Characteristic
Capacité d'entrée
10.2 pF
Capacité de sortie …… T,
8 pF
Tension d'anod@ ….….……....….…eerrerrriereesecennecrenreese VA
250 V
Tension de grille n°2 .....…..…iasioceserseorecamressorccee VZ
250 V
Courant d'anode …… … Ia
36 mA
Courant de grille n° 2 … … 18
5.2 mA
Pente ……c … S
10 mA
Data set 08
1999 Philips E-Z
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
EL 41
9 W
The EL 41 is an indirectly heated output pentode having a slope of [1]
10 mA/V
The EL 41 is an indirectly heated output pentode having a slope of [2]
9 W
for an A.C. grid voltage of only 3.8 Vg5, the output power is
3.9 W
at an A.C. voltage of this value (the grid bias is
7 V
distortion. Grid current does not commence to flow until the output reaches
4.8 W
As previously stated, the maximum anode dissipation of the EL 41 is
9 W
exeed
9 W
b) to allow the anode dissipation to exceed the specified
9 W
of the EL 41 in a receiver shall be
9 W
dissipation should be adjustcd to
9 W
lator voltage of [1]
7 V
lator voltage of [2]
8 V
The lower limit specified for the accumulator voltage should be
5.5 V
Heater voltage . . . . . . F
6.3 V
Output power at 109, dlstortlon Wo(dipr=10%,)
39 W
starting point . . . . . . Wy(lu=403ud)
4.8 W
Sensitivity e e e o V(
50 mW
Screen grid current . . . . . I, =2x52
2x8 mA
Other
In a class A push-pull amplifier, with V,=V,, [1]
250 V
ClassA;PushPull
In a class A push-pull amplifier, with V,=V,, [2]
4.4 W
ClassA;PushPull
deliver [1]
1.55 W
ClassA;PushPull
deliver [2]
250 V
ClassA;PushPull
Control grid bias . . . . . Vg = —
7 V
ClassA
Anode current .o a
36 mA
ClassA
Screen grid current . . . . Ip
52 mA
ClassA
Screen grid voltage . . . . TV,
250 v
ClassA;PushPull
Matching resistance . . . . Ry
7 ko
ClassA;PushPull
A.C. input voltage N 2 = 0
3.6 Vs
ClassA;PushPull
Anode current . N = 2X36
2x39.5 mA
ClassA;PushPull
Capacitance
Input capacitance . . . . Cot
10.2 pF
Output capacitance R o
7.8 pF
Anode-control grid oo Cop
< 1 pF
Control grid-heater . . . . . Cyy
< 0.15 pF
Anode voltage . . . .. Vs
250 V
ClassA
Screen grid voltage . . . . Vg
250 V
ClassA