TB 3/2000
0 Tubes in archive
BrandPhilips
ClassTransmitting Triode
Base40205
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Materialthoriated tungsten
Absolute Maximum Ratings
Plate Voltage3500 V
Plate Dissipation1100 W
Cathode Current1400 mA
Audio Performance
Key Features
- Thoriated tungsten filament
- Direct heating
- High frequency amplifier
- Oscillator
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| H.F. class C telegraphy | 3500V | 18000 | - | - | 1140mA |
| H.F. class B telephony | 3500V | 18000 | - | - | 485mA |
| L.F. class B amplifier (two valves) | 3000V | - | - | - | 1300mA |
Application Notes
The tube should be supported if it is mounted with base up. Mounting position: arbitrary with plane of anode vertical.
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