Data set 01
1958 Mullard Receiving Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Application
Audio output
Power - Pentode Single (NOT beam) (under 10W) ·Pentode-Pentode
QP22B
Directly heated double output pentode for battery audio power service, providing two matched sections for economical push-pull receiver output.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B7
- Base pins
- 7
- Nominal heater
- 2 V / 300 mA
Description
Directly heated double output pentode for battery audio-output service.
Socket description
Medium 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B7
- Base pins
- 7
- Nominal heater voltage
- 2 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
2 physical sections, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Two identical output-pentode sections; represented once under identical-section compression.
Section 2
Pentode
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Second identical physical output-pentode section; added without unsupported electrical promotion.
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.