Tube-number record
ECH 71
0 archive entries
ECH 71 is a tube type in the TubeDatabase archive (class: Triode-Heptode). Recorded specifications: year 1950, construction Multi-section, socket Loctal, maximum plate voltage 300 V, and maximum plate dissipation 2 W. The archive does not yet hold a photographed example of this type.
ClassTriode-Heptode
BaseLoctal
Filament6.3 V @ 330 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesIndirectly heated cathode
Absolute Maximum Ratings
Plate Voltage300 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode (Static) | 100 V | 3200 | — | 22 | 12 mA |
| Heptode (Static) | 250 V | 2200 | 1000000 | — | 3 mA |
| Heptode (Mixer) | 250 V | 750 | 1400000 | — | 1.5 mA |
Application Notes
Triode-Heptode for HF, ZF, and NF amplification and frequency mixing.
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