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

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Tube-number record

GAS FILLED COLD CATHODE TRIGGER TUBE

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ClassTrigger Tube
BaseNoval (B9A)

Construction

Primary TypeOther / special
Envelope
Glass
SectionsSingle

Filament / Heater

Absolute Maximum Ratings

Plate Voltage350 V
Grid 1 Voltage150 V
Cathode Current40 mA

Audio Performance

Key Features
  • Molybdenum cathode
  • Electrical priming
  • Noval Base
  • Any mounting position

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
A.C. Operation250 V———40 mA
D.C. Operation300 V———20 mA

Application Notes

The primer discharge can be established by connecting the primer via a 10 MOhm resistor to the anode supply voltage. Starter and primer resistances should be mounted directly on the socket to avoid stray capacitances.

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