Voltage Radio Detector Converter ·Heptode
X31
Radio receiver frequency changer designed for superheterodyne mixer and oscillator service. Its multi-grid construction performs signal conversion, often integrating local oscillation and mixing within one valve.
- Sections
- 1
- Base
- -
- Socket code
- B7
- Base pins
- -
- Nominal heater
- 4 V / 1 A
Description
A triode-hexode frequency changer for superheterodyne receivers, with a cathode common to the hexode mixer and triode oscillator sections and variable-mu control on the mixer section.
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
Published ratings and characteristics promoted from the 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.