Tube-number record
8453/Z550M
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BrandAmperex
ClassCold Cathode Numerical Indicator Tube
BaseSpecial / none
Construction
Primary TypeOther / special
EnvelopeTop viewing glass bulb
Sections10 cathodes (0-9)
Filament / Heater
Absolute Maximum Ratings
Plate Voltage150 V
Cathode Current6 mA
Audio Performance
Key Features
- Long-life
- Numerical indicator 0 to 9
- Bright red glow
- Pure molybdenum cathode
- Transistorized control compatible
- Neon glow discharge
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Standard Rectified AC | 117 V | — | — | — | — |
Application Notes
The tube operates with a neon glow discharge on a pure molybdenum cathode. Rectified AC voltage should be freed from spikes by a capacitor (approximately 0.033 uF for full wave or 0.25 uF per tube for half wave). Selected by raising starter voltage at least 5 volts relative to remaining starters.
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