Z303C
0 Tubes in archive
BrandValvo
ClassNumerical Indicator Tube
Construction
Primary TypeCold Cathode Counting Tube
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
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Counting | 475V | - | - | - | - |
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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