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Tube Database (1,270 tubes)

Other (3257), Pre (2314), Power (1030), Rectifier (740)
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Tube-number record

Z303C

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BrandValvo
ClassNumerical Indicator Tube

Construction

Primary TypeOther / special
EnvelopeGlass
Sections10-stage dekatron

Filament / Heater

Absolute Maximum Ratings

Plate Voltage475 V

Audio Performance

Key Features
  • Transistor-controlled
  • Dekadische Zählröhre
  • Negative pulse triggering

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Counting475 V————

Application Notes

Described as being driven by a transistor blocking oscillator (OC72). Auxiliary cathodes (KA, KB) receive a static bias of approximately 36V, increasing to 42V during 4kHz operation.

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