Tube-number record
RL 4,2 P40
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BrandTelefunken
ClassSendepentode
BaseSpecial / none
Construction
Primary TypePentode
EnvelopeGlass
Sections1
Filament / Heater
Materialoxide
Absolute Maximum Ratings
Plate Voltage800 V
Plate Dissipation35 W
Grid 2 Voltage200 V
Cathode Current150 mA
Audio Performance
Key Features
- 40 Watt power output
- Directly heated oxide cathode
- Transmitting pentode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| HF-Verstärkung (B-Betrieb) @ 800V | 800 V | 3800 | 5500 | — | 90 mA |
| HF-Verstärkung (B-Betrieb) @ 400V | 400 V | 3800 | 2300 | — | 100 mA |
| HF-Verstärkung (C-Betrieb) | 800 V | — | 4450 | — |
Application Notes
For series connection of three tubes, heater voltage fluctuations between 11V and 13.5V are permitted. Underheating at 3.6V can lead to 30% power loss in HF operation.
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