Tube-number record
HCH 81
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BrandPhilips
ClassTriode-Heptode
BaseNoval (B9A)
Filament12.6 V @ 150 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Base MaterialGlass
SectionsTwo (Triode and Heptode)
Filament / Heater
Heater NotesIndirect; series or parallel supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation1.7 W
Grid 2 Voltage125 V
Grid 1 Voltage-1.3 V
Cathode Current12.5 mA
H-C Voltage100 V
Audio Performance
Key Features
- Low microphonic effect
- A.M./F.M. receiver compatible
- Controlled inter-section capacitance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Section | 100 V | 3700 | — | 22 | 13.5 mA |
| Heptode Section Mixer | 200 V | 775 | 1000000 | — | 3.7 mA |
| Heptode Section R.F./I.F. Amplifier | 200 V | 2400 | 500000 | — | 7.4 mA |
Datasheets
Datasheet: HCH81.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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