UBF89
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BrandTESLA
ClassCombined Double Diode and Remote-Cutoff Pentode
BaseNoval
Filament19V @ 100mA
Construction
Primary TypePentode-Diode
EnvelopeGlass
Base MaterialGlass
Sections3
Filament / Heater
MaterialOxide
Heater NotesSerial supply (AC or DC)
Absolute Maximum Ratings
Plate Voltage200 V
Plate Dissipation2.25 W
Grid 2 Voltage200 V
Grid 1 Voltage-1.3 V
Cathode Current16.5 mA
H-C Voltage150 V
Audio Performance
Key Features
- Combined double diode and remote-cutoff HF pentode
- Internal shielding connected to cathode
- Separate diode systems (except shared cathode)
- Suitable for HF, MF, and LF amplification and AM demodulation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| HF/MF Amplifier | 200V | 4500 | 600000 | 20 | 9mA |
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