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A horizontal ribbon.

2C40A
Planar Triode

EIA Base & Outline

EIA Base: 2C40

Substitute Data

Preferred Substitutes ......................... 4037
Source ........................................ RCA TT-5 - 1962

Application

Source ........................................ RCA TT-5 - 1962
The 2C40A is a triode of lighthouse construction designed for use as a CW oscillator, radio-frequency amplifier, or plate-pulsed oscillator at frequencies as high as 3370 MHz.

Source ........................................ RCA TT-5 - 1962
The radio-frequency cathode connection is made through a disk-type capacitor which is incorporated in the tube. This results in a low-impedance radio-frequency path from the cathode to the external circuit.

Source ........................................ RCA TT-5 - 1962
The envelope construction results in low losses, provides convenient electrode contact surfaces, and enables the tube to fit easily into coaxial circuits. Requires an octal socket.

Mechanical Data

Source ........................................ RCA TT-5 - 1962
Bulb .......................................... Special
Base Type ..................................... Glass & Metal
Maximum Overall Height ........................ 2.563 In.
Maximum Diameter .............................. 1.312 In.
EIA Base ...................................... 2C40
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA TT-5 - 1962
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.75 A

Direct Interelectrode Capacitances (approx)

Triode
Source ........................................ RCA TT-5 - 1962
Input ......................................... 2.15 pf
Output ........................................ 0.03 pf
Grid to Plate ................................. 1.3 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ RCA TT-5 - 1962
Plate Voltage ................................. 500 V
Plate Dissipation ............................. 6.5 W
Bulb Temperature (At Hottest Point) ........... 175 °C

Characteristics and Typical Operation

Class C Oscillator/Amplifier (CCS)
Source ........................................ RCA TT-5 - 1962
Plate Voltage ................................. 500 V
Grid No. 1 Voltage ............................ -50 V
Grid No. 1 Current ............................ 8 mA
Plate Current ................................. 25 mA
Power Output (approx) ......................... 0.075 W

Class C Oscillator/Amplifier (3370 MHz)
Source ........................................ RCA TT-5 - 1962
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -5 V
Grid No. 1 Current ............................ 0.3 mA
Plate Current ................................. 20 mA
Power Output (approx) ......................... 0.075 W

Class C Oscillator/Amplifier (3370 MHz)
Source ........................................ RCA TT-5 - 1962
Plate Voltage ................................. 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 200 Ω
Grid No. 1 Current ............................ 0.3 mA
Plate Current ................................. 17 mA
Power Output (approx) ......................... 0.075 W

Class C Oscillator/Amplifier (3000 MHz)
Source ........................................ RCA TT-5 - 1962
Plate Voltage ................................. 1400 V
Grid No. 1 Current ............................ 0.3 mA
Plate Current ................................. 1000 mA
Power Output (approx) ......................... 300 W

Class C Oscillator (Plate Pulsed)
Source ........................................ RCA TT-5 - 1962
Plate Voltage ................................. 1400 V
Grid No. 1 Voltage ............................ -100 V
Grid No. 1 Current ............................ 1000 mA
Plate Current ................................. 2000 mA
Power Output (approx) ......................... 600 W

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Sat, 04 Dec 2021 16:36:35 -0700