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Tube Database (7,341 tube types · 1,270 archive entries)

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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

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Both Sections Operating100 V1500——2.2 mA
Grid 3 Characteristics100 V180———

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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