Data set 01
1951 Mullard Valve and Service Manual
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
HeaterOrFilamentVoltage
19 V
HeaterOrFilamentCurrent
300 mA
Other
Power Output
1.2 W
AudioOutput
Power - TV Vertical Output ·Pentode
PL33
Power-output pentode designed for television frame/vertical time-base output and audio power-amplifier service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- IO
- Base pins
- 8
- Nominal heater
- 19 V / 300 mA
Description
High-sensitivity output pentode for television frame time-base or audio-output service.
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
- 19 V
- Nominal heater current
- 300 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
- 55000 Ω
- Transconductance
- 0.0086 S
- 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 ratings and characteristics promoted from the supplied valve-data source where explicitly available.
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
1963 Mullard
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Class-A plate voltage
200 V
ClassA
Class-A screen voltage
200 V
ClassA
Class-A plate current
28 mA
ClassA
Class-A screen current
3 mA
ClassA
Class-A grid voltage
-4.65 V
ClassA
Class-A optimum load
7000 ohm
ClassA
Class-A output at onset grid current
2.55 W
ClassA
Pulse plate voltage maximum
550 V
Pulse
Pulse screen voltage maximum
550 V
Pulse
Heater-cathode voltage maximum
300 V
Capacitance
Plate-grid capacitance
1 pF