Voltage Radio Detector Converter ·Heptode
41MPG
Cossor heptode frequency changer for superheterodyne radio receivers. Its multi-grid construction combines local-oscillator and mixer functions, converting incoming RF signals to the receiver intermediate frequency in a single valve.
- Sections
- 1
- Base
- -
- Socket code
- B7
- Base pins
- -
- Nominal heater
- 4 V / 1 A
Description
Cossor 41MPG heptode 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
- -
- Nominal heater voltage
- 4 V
- Nominal heater current
- 1 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
Heptode
- Max plate voltage
- 250 V
- Max screen voltage
- 100 V
Cossor 41 M.P.G. indirectly heated 4 V 1 A variable-mu pentagrid (heptode) frequency changer for superheterodyne receivers, with integral local oscillator and mixer. Published maximum modulator-anode voltage 250 V, modulator-screen voltage 100 V, and oscillator-anode voltage 100 V. Recommended modulator-grid bias is negative and varies with gain-control setting. Oscillator coupling is internal, reducing harmonic-related whistles. Mixer conversion conductance is an application-dependent characteristic and must not be substituted for intrinsic transconductance. Manufacturer 1936 technical data and characteristic curves.
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.