HK-57
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BrandHeintz and Kaufman
ClassBeam Pentode
BaseJohnson #101 or #247
Construction
Primary TypeBeam Pentode
EnvelopeNonex Glass
Base MaterialEnclosed Cylindrical Tantalum
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage3000 V
Plate Dissipation50 W
Grid 2 Voltage500 V
Grid 1 Voltage-400 V
Cathode Current150 mA
Audio Performance
Key Features
- Radiation cooled
- Very high frequency performance
- Tantalum plate and grid elements
- No neutralization required
- High mutual conductance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Radio Frequency Power Amplifier Class C Unmodulated | 3000V | - | - | - | 100mA |
| Radio Frequency Power Amplifier Class C Unmodulated | 2000V | - | - | - | 110mA |
| Radio Frequency Power Amplifier Class C Plate Modulated | 2500V | - | - | - | 96mA |
Application Notes
The HK-57 is capable of very high frequency operation and does not require neutralization. It has very low driving power requirements and can withstand large momentary overloads due to tantalum construction.
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