ECH 21
0 Tubes in archive
BrandPhilips
ClassTriode-Heptode
BaseLoctal
Filament6.3V @ 0.33mA
Construction
Primary TypeTriode-Heptode
EnvelopeGlass
Base MaterialMetal/Glass
Sections2
Filament / Heater
Heater NotesIndirect AC or DC parallel supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.1 W
Grid 2 Voltage250 V
Audio Performance
Key Features
- Vangrooster (suppressor grid) for low noise
- Variable transconductance (regelbare steilheid)
- High conversion transconductance
- Low frequency drift on shortwave
- Sleutelbuis (Key tube) construction
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Frequency Changer (Mixer) | 250V | 750 | 1400000 | - | 3mA |
| Triode Oscillator Section | 100V | 3200 | - | - | - |
Application Notes
Recommended as a frequency changer/mixer. Heptode section can be used as an IF amplifier and the triode as an AF amplifier. Suitable for phase inversion in push-pull stages.
Datasheet Viewer
Loading datasheet...
Showing 1 to 0 of 0 results