Tube-number record
HL90
0 archive entries
HL90 is a tube type in the TubeDatabase archive (class: Pentode). Recorded specifications: year 1953, construction Pentode, base Glass, socket Miniature 7-pin (B7G), maximum plate voltage 250 V, and maximum plate dissipation 6 W. The archive does not yet hold a photographed example of this type.
ClassPentode
BaseMiniature 7-pin (B7G)
Filament— V @ 150 mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialGlass
Sections1
Filament / Heater
Heater NotesSeries supply (Serienspeisung)
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation6 W
Grid 2 Voltage250 V
Cathode Current50 mA
H-C Voltage150 V
Audio Performance
Typical THD10%
Power Output2.4 W
Key Features
- Oxide cathode
- Indirectly heated
- NF-Endverstärkung
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Output Stage | 170 V | 4800 | 30000 | — | 33 mA |
Application Notes
The maximum permissible deviation of the heater current is +/- 6% from the setpoint 150 mA. Heater pin h4 should preferably be grounded.
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