Data set 01
1960 Mazda
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Recommended anode voltage
135 V
PushPull
Anode-to-anode load
16000 ohm
PushPull
Power - Pentode (NOT beam) ·Pentode-Pentode
QP240
Matched double pentode designed for quiescent push-pull battery-receiver output stages, with individually identified sections for balanced audio power operation.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- -
- Base pins
- 9
- Nominal heater
- 2 V / 450 mA
Description
Double pentode designed for the output stage of battery receivers using quiescent push-pull operation; the two sections are matched and individually identified.
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- -
- Base pins
- 9
- Nominal heater voltage
- 2 V
- Nominal heater current
- 450 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
- Transconductance
- 0.004 S
- Max plate voltage
- 150 V
- Max screen voltage
- 150 V
One representative section row for two matched pentode sections; source discusses section grading by screen voltage.
Section 2
Pentode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.004 S
- Max plate voltage
- 150 V
- Max screen voltage
- 150 V
Second physical pentode section; added to align rows with SectionCount.
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.