Data set 01
1936 Cossor Valve Manual
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Optimum load
8000 ohm
Published datasheet value
Voltage Pentode - Sharp Cutoff (single) ·Pentode
42MPPEN
Cossor high-slope pentode for receiver and amplifier service, providing unusually high transconductance for an early 4 V heater design.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B7
- Base pins
- 7
- Nominal heater
- 4 V / 2 A
Description
Cossor 42MPPEN pentode for receiver/amplifier service as specified in the supplied catalogue datasheet.
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
- 4 V
- Nominal heater current
- 2 A
- 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
- Transconductance
- 0.007 S
- Max plate voltage
- 250 V
- Max screen voltage
- 250 V
Published ratings and characteristics promoted from approved datasheet.
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
193X Cossor
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Optimum load
8000 ohm
Published datasheet value