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The 3CX15000A7 is a metal-ceramic sealed, forced air cooled triode with a thoriated tungsten carbide cathode and a high amplification factor. The operating frequency is 110MHz, the anode dissipation power is 15kW and grid dissipation 500w. It’s mainly used for zero-bias voltage Class B RF amplifiers or Class C amplifiers, and also grid-grounded FM amplifiers. When the grid is grounded, the tube can obtain a power gain of 20 times.

Specifications:

Filament Voltage……6.3V

Filament Current……160A

Amplification Factor……200

Interelectrode Capacitances (Grounded cathode)

        Input……61pF          Feedback……0.2pF  Output……36Pf

Mounting……Upright, anode up or down

Cooling……forced air for core column and anode

Weight……5.5kg

Temperature at anode shell and seals……250℃

Maximum ratings:

DC Anode Voltage……8kV

DC Anode Current……6A

Anode Dissipation……15kw

Grid Dissipation……500W

Maximum Frequency (continuous wave)……110MHz

Typical conditions

(Cathode-driven class AB RF linear amplifier)

DC Anode Voltage……7000v

Zero Signal Anode Current……0.6A

Signal Anode Current……5A

Signal Grid Current……1A

Drive Resistance……32Ω

Resonant Load Resistance……745Ω

Signal Driving Power……1540w

Anode Output……24.2kw

(Cathode-driven class C RF amplifier, continuous wave or FM)

Anode Voltage……7kV

Anode Current……4.55A

Grid Voltage……-200V

Grid Current……1.06A

Drive Resistance……53Ω

Driving Power……2600w

Anode Dissipation…… 6.3kW

Effective Output Power……25.5kW

Anode Load Resistance……800Ω