Tube-number record
ECH 2
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BrandPhilips
ClassTriode-Heptode
Filament6.3 V @ 0.95 mA
Construction
Primary TypeMulti-section
Sections2
Filament / Heater
Heater NotesIndirect heating, parallel filament supply
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
Grid 2 Voltage125 V
Grid 1 Voltage-1.3 V
Cathode Current25 mA
H-C Voltage50 V
Audio Performance
Key Features
- Independently heated
- Frequency converter
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Heptode section as frequency converter | 250 V | 750 | 1500000 | — | 3.25 mA |
| Triode section as oscillator | 100 V | 5500 | — | 17.5 | 9.5 mA |
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