Tube-number record
18042
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BrandPhilips
ClassSpecial Quality Pentode
BaseNoval (B9A)
Filament18 V @ 0.1 mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialGlass
SectionsSingle
Filament / Heater
Heater NotesIndirect by AC or DC; series or parallel supply
Absolute Maximum Ratings
Plate Voltage210 V
Plate Dissipation2.1 W
Grid 2 Voltage210 V
Grid 1 Voltage-1.1 V
Cathode Current16 mA
H-C Voltage100 V
Audio Performance
Typical THD10%
Power Output0.66 W
Key Features
- Special Quality (SQ)
- Long life (>10,000 hours)
- Shock and vibration resistant
- Suitable for series or parallel heater supply
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Class A | 210 V | 9000 | 500000 | 38 | 10 mA |
| Pentode Class A Low Voltage | 120 V | 8200 | 420000 | 38 | 8.3 mA |
Application Notes
Designed for use in telephone equipment and high-reliability wide-band amplifiers.
Datasheets
Datasheet: 18042.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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