Tube-number record
812A
0 archive entries
812A is a tube type in the TubeDatabase archive (class: Power Triode). Recorded specifications: brand RCA, year 1963, construction Triode, base Micanol, socket 4-pin, maximum plate voltage 1500 V, and maximum plate dissipation 65 W. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassPower Triode
Base4-pin
Construction
Primary TypeTriode
EnvelopeST19
Base MaterialMicanol
Sections1
Filament / Heater
MaterialThoriated Tungsten
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier - Class B (CCS) | 1250 V | — | — | 29 | 260 mA |
| AF Power Amplifier - Class B (ICAS) | 1500 V | — | — | 29 | 310 mA |
| RF Power Amplifier - Class C Telegraphy (CCS) | 1250 V | — | 3000 | 29 |
Application Notes
When used in the final amplifier of a transmitter designed for break-in operation and oscillator keying, a small amount of fixed bias must be used to maintain the plate current at a safe value.
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