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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