Tube-number record
TRIODE-PENTODE CONVERTER
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BrandRCA
ClassReceiving Tube
BaseNoval (B9A)
Filament18.9 V @ 150 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Base MaterialSmall-Button Noval
SectionsTriode, Pentode
Filament / Heater
Heater NotesDesigned for series-string operation
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.2 W
Grid 2 Voltage250 V
Grid 1 Voltage-40 V
H-C Voltage100 V
Audio Performance
Key Features
- 9-Pin Miniature Type
- Sharp-cutoff pentode
- Medium-mu triode
- Low interelectrode capacitances
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Unit (Amplifier) | 100 V | 5800 | 6900 | 40 | 8.5 mA |
| Pentode Unit (Amplifier) | 250 V | 4600 | 750000 | — | 7.7 mA |
| Pentode Unit (Triode-Connected Amplifier) | 150 V | 4000 | 7900 | 42 |
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