Tube-number record
3BU8
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BrandTung-Sol
ClassTwin Pentode
BaseNoval (B9A)
Filament3.15 V @ 600 mA
Construction
Primary TypePentode
EnvelopeMiniature JEDEC 6-3
Base MaterialSmall Button 9-Pin
Sections2
Filament / Heater
Warm-up Time11s
Heater NotesAC or DC, Series or Parallel operation
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1.1 W
Grid 2 Voltage150 V
Grid 1 Voltage50 V
Cathode Current12 mA
H-C Voltage200 V
Audio Performance
Key Features
- Separate Plates
- Separate Grid 3
- Common Screen Grid
- Common Grid 1
- Common Cathode
- Controlled Heater Warm-up Time
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Both Sections Operating | 100 V | 1500 | — | — | 2.2 mA |
| Grid 3 Characteristics | 100 V | 180 | — | — | — |
Application Notes
Intended for use as a combined sync-separator and sync-clipper/AGC generator in television receivers. Noise pulses can be suppressed utilizing common Grid #1.
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