Tube-number record
HD23
0 archive entries
HD23 is a tube type in the TubeDatabase archive (class: Double Diode Triode). Recorded specifications: brand Marconi, construction Triode, and socket 5-pin. The archive does not yet hold a photographed example of this type.
BrandMarconi
ClassDouble Diode Triode
Base5-pin
Construction
Primary TypeTriode
EnvelopeMetallised
SectionsDouble Diode Triode
Filament / Heater
Absolute Maximum Ratings
Audio Performance
Key Features
- Economy of filament current
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RC Coupled, 50,000 ohms load | 120 V | — | — | 22 | 1 mA |
| RC Coupled, 0.25 megohms load | 120 V | — | — | 27 | 0.2 mA |
| RC Coupled, 50,000 ohms load | 150 V | — | — | 22 |
Application Notes
Owing to its high magnification factor the HD23 will usually be resistance capacity coupled to the subsequent valve. Its low impedance however makes transformer coupling quite possible, and in this case 1-1.5 volts grid bias is desirable. The diode connected to pin No. 5 should be used for signal rectification.
Datasheets
Datasheet: HD23.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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