Tube-number record
ENDPENTODE
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BrandTelefunken
ClassPower pentode
BaseNoval (B9A)
Filament6.3 V @ 760 mA
Construction
Primary TypePentode
EnvelopeGlass
Sections1
Filament / Heater
Heater NotesIndirectly heated, DC-AC heating
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation10.5 W
Grid 2 Voltage250 V
Cathode Current75 mA
H-C Voltage100 V
Audio Performance
Key Features
- Power pentode for vertical deflection
- Pico 9 / Noval base
- DC/AC parallel heating
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Dynamic conditions (Pulse) | 50 V | — | — | — | 200 mA |
| Dynamic conditions (Pulse) | 65 V | — | — | — | 285 mA |
Application Notes
To account for tube tolerances and life decrease, circuits should be designed for 60% of the peak anode current rating at Ug1 = -1V.
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