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
EL33
High-sensitivity output pentode for audio power amplification in AC mains-operated equipment.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- IO
- Base pins
- 8
- Nominal heater
- 6.3 V / 900 mA
Description
High-sensitivity output pentode for audio power amplification in AC mains-operated equipment.
Socket description
International Octal
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- IO
- Base pins
- 8
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 900 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
- 50000 Ω
- Transconductance
- 0.009 S
- Amplification factor
- 23
- Max plate voltage
- 250 V
- Max screen voltage
- 275 V
- Max plate dissipation
- 9 W
- Max screen dissipation
- 2.5 W
- Max cathode current
- 55 mA
Published source values promoted where applicable; additional values retained as parameters.
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
1967 Mullard Receiving Tubes for Maintenance
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate voltage
250 V
ClassA
Screen-grid voltage
250 V
ClassA
Plate current
36 mA
ClassA
Screen-grid current
4 mA
ClassA
Control-grid voltage
-6 V
ClassA
Transconductance
9 mA/V
ClassA
Plate resistance
50 kOhm
ClassA
Load resistance
7 kOhm
ClassA
Power output
4 W
ClassA
Power output
8.2 W
PushPull TwoTubes
Plate voltage
250 V
TriodeConnection
Power output
1.1 W
TriodeConnection
Maximum plate voltage
250 V
Maximum plate dissipation
9 W
Maximum screen-grid voltage
275 V
Maximum screen-grid dissipation
2.5 W
Maximum cathode current
55 mA
Data set 03
1999 Philips E-Z
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Chguffage: indirect par C.A. ou C.C.; ve
6.3 V
Wo (dtot= 10%)
4.5 W
Vi (Wo
50 mW
Wg2 (Wo=max.) = max
2.5 W
Ix = maxX
55 mA
Vg1{Ig1=+0,3ul)= max
1.3 V
Vet = max
100 V
Other
Va
250 V
ClassA
Vg2
250 V
ClassA
\rs
-6 V
ClassA
Betriebsdaten Klasse A
36 mA
ClassA
Va
250 v
ClassA
Va2
250 v
ClassA
Ig = 2x24
2x28.5 mA
ClassA
Ig2 = 2x2,8
2x4.6 mA
ClassA
Vo = [¢]
8.2 w
ClassA
Va, = max
550 V
Va = max
300 V
Wa = maXe
9 w
Vg2, = max
550 V
Vg2 = max
300 V
Wg2 (V1=0) = max
1.2 W