ECH 4
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ClassTriode-heptode
BaseSide-contact (P-base)
Filament6.3V @ 0.2mA
Construction
Primary TypeTriode-heptode
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesIndirect heating, AC/DC
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1.5 W
Grid 2 Voltage300 V
Grid 1 Voltage-1.3 V
Cathode Current15 mA
H-C Voltage50 V
Audio Performance
Typical THD1.5%
Key Features
- Triode and heptode sections separate
- Applicable as mixer, IF amplifier, or phase inverter
- High gain triode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Heptode Mixer | 250V | 750 | 1400000 | - | 3mA |
| Heptode IF Amplifier | 250V | 2200 | 900000 | - | 5.3mA |
| Triode Static | 100V | 3200 | - | 22 | 12mA |
| Triode AF Amplifier (R-C coupled) | 250V | - | - | 13 | 1mA |
Application Notes
Commonly used as a frequency changer/mixer where the triode serves as the local oscillator.
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