Tube-number record
AMPLIFIER TRIODE
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BrandRCA
ClassPower Triode
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
Base MaterialMedium-Shell Small 4-Pin with Bayonet
SectionsSingle
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Plate Voltage350 V
Plate Dissipation10 W
Grid 1 Voltage-150 V
Cathode Current40 mA
Audio Performance
Typical THD5%
Power Output0.6 W
Key Features
- Thoriated Tungsten Filament
- Useful at frequencies up to 30 Mc
- Medium 4-pin bayonet base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier and Modulator - Class A | 350 V | 980 | 8700 | 8.5 | 9 mA |
| RF Power Amplifier - Class B Telephony | 350 V | — | — | — | 32 mA |
| Plate-Modulated RF Power Amplifier - Class C Telephony | 300 V | — | — | — |
Application Notes
Data on operating frequencies for the 5556 are given on the sheet TRANS, TUBE RATINGS vs FREQUENCY. Class C FM Telephony ratings are identical to Class C Telegraphy.
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