3BU8A
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BrandJEDEC
ClassReceiving Tube
Base9-Pin Miniature
Filament3.15V @ 600mA
Construction
Primary TypeTwin Pentode
EnvelopeT-6 1/2 Glass
Sections2
Filament / Heater
Heater NotesControlled heater warm-up time for series string operation
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1.1 W
Grid 2 Voltage150 V
Grid 1 Voltage-50 V
Cathode Current12 mA
H-C Voltage200 V
Audio Performance
Key Features
- Separate plates and G3
- Common screen, G1 and cathode
- High positive G3 current in region below 50V
- Unilaterally interchangeable with 3BU8
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Each Section Separately | 100V | 1500 | - | - | - |
| Grid 3 Characteristics | 100V | 180 | - | - | - |
Application Notes
Intended for use as a combined sync separator-clipper and AGC tube in television receivers.
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