Tube-number record
20TC4
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BrandTesla
ClassHydrogen Discharge Tube (Tacitron)
BaseNoval (B9A)
Filament6.3 V @ 550 mA
Construction
Primary TypeOther / special
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialOxide
Warm-up Time180s
Heater NotesIndirectly heated, parallel supply
Absolute Maximum Ratings
Plate Voltage400 V
Grid 1 Voltage-60 V
Cathode Current55 mA
Audio Performance
Key Features
- Hydrogen filled
- Short ionization time
- Short deionization time
- Grid controlled ignition and extinction
- Tacitron technology
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Switching/Relay | 300 V | — | — | — | 30 mA |
Application Notes
Designed for relay technology, pulse shaping circuits, oscillators, switching power circuits, servomechanisms, and generating sawtooth or rectangular voltages. Can replace conventional thyratrons while simplifying circuits and increasing switching frequency.
Datasheets
Datasheet: 20TC4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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