Voltage - Triode (with diode, heptode or hexode) ·Heptode-Triode
ECH71
Triode-heptode combination for receiver frequency-changing service, integrating a local oscillator with a multi-grid mixer to produce the intermediate-frequency output required by superheterodyne front ends.
- Sections
- 2
- Base
- -
- Socket code
- B8G
- Base pins
- 8
- Nominal heater
- 6.3 V / 350 mA
Description
Triode-heptode for oscillator, mixer and IF-amplifier service.
Socket description
Loctal 8-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B8G
- Base pins
- 8
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 350 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
Triode
No fixed ratings are recorded for this section.
Lorenz ECH71 oscillator/amplifier triode of a triode-heptode frequency changer. Triode grid may be connected to heptode grid 3 for oscillator/mixer operation or separated for RC-coupled AF service. Manufacturer publishes triode interelectrode capacitances. Heater is 6.3 V, approximately 0.35 A for the complete tube.
Section 2
Heptode
No fixed ratings are recorded for this section.
Lorenz ECH71 heptode frequency-converter/IF-amplifier section with variable gain; triode oscillator can drive its third grid. Manufacturer publishes heptode and inter-section capacitances, and mode-specific IF/converter characteristics. Do not treat the separately specified cold-electrode voltage as a continuous operating maximum.
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.