Tube-number record
56
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BrandRCA
ClassSuper-Triode Amplifier Detector
Base5-pin
Filament2.5 V @ 1000 mA
Construction
Primary TypeTriode
EnvelopeST-12
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Audio Performance
Key Features
- Heater-cathode type
- High mutual conductance
- High amplification factor
- Resistance-coupled audio-frequency amplifier capability
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Amplifier | 100 V | 1150 | 12000 | 13.8 | 2.5 mA |
| Amplifier | 250 V | 1450 | 9500 | 13.8 | 5 mA |
Application Notes
Used as detector, amplifier, or oscillator in a-c receivers. Grid leak detector: 45V plate, 1-5 megohm leak, 0.00025 uf condenser. Grid-bias detector: 250V plate supply, -20V bias, 0.2 mA plate current. The cathode should be connected to mid-tap on heater winding.
Datasheets
Datasheet: 56.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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