ECH 42
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BrandPhilips
ClassTriode-Hexode Frequency Changer
BaseRimlock
Filament6.3V @ 230mA
Construction
Primary TypeTriode-Hexode
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesIndirect heating; Parallel supply
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1.5 W
Grid 2 Voltage125 V
Grid 1 Voltage-1.3 V
Cathode Current10 mA
H-C Voltage100 V
Audio Performance
Key Features
- Indirectly heated
- Frequency changer
- Phase inverter
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Hexode section as frequency changer | 250V | 750 | 1000000 | - | 3mA |
| Triode section | 100V | 2800 | - | 22 | 10mA |
| Triode section as oscillator | 250V | 600 | - | - | 5.1mA |
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