UF86
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BrandMullard
ClassVoltage Amplifying Pentode
BaseB9A
Filament12.6V @ 100mA
Construction
Primary TypePentode
EnvelopeGlass
Base MaterialGlass
SectionsSingle
Filament / Heater
Heater NotesSuitable for series operation, a.c. or d.c.
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation1 W
Grid 2 Voltage200 V
Cathode Current6 mA
H-C Voltage150 V
Audio Performance
Typical THD5%
Key Features
- Low-noise
- R.C. coupled a.f. voltage amplifier
- Series connected heaters
- Rigid electrode structure
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 200V | 2000 | 2500000 | 38 | 3mA |
Application Notes
Specifically intended for early stages of high-gain audio amplifiers and microphone preamplifiers. Hum level is approximately 8uV-12uV.
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