Tube-number record
TRIODE / PENTODE
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TRIODE / PENTODE is a tube type in the TubeDatabase archive (class: Receiving Tube). Recorded specifications: brand TELEFUNKEN, construction Indirectly heated, base Glass, socket Noval (B9A), maximum plate voltage 300 V, and maximum plate dissipation 1.4 W. The archive does not yet hold a photographed example of this type.
BrandTELEFUNKEN
ClassReceiving Tube
BaseNoval (B9A)
Filament6.3 V @ 450 mA
Construction
Primary TypeIndirectly heated
EnvelopeGlass
Base MaterialGlass
SectionsTriode, Pentode
Filament / Heater
Heater NotesDC-AC-Heating, connected in parallel
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1.4 W
Grid 2 Voltage250 V
Grid 1 Voltage-200 V
Cathode Current15 mA
H-C Voltage100 V
Audio Performance
Key Features
- Triode/Pentode for TV and Reactance applications
- Indirectly heated
- Pico 9 Noval base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode | 200 V | 3500 | 20000 | 70 | 3.5 mA |
| Pentode (Operation Point 1) | 100 V | — | — | — | 12.5 mA |
| Pentode (Operation Point 2) | 200 V | 5500 | — | 47 | 6 mA |
Application Notes
Triode used as reactance tube; Pentode used as sine oscillator and pulse shaper in TV sets.
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