NJ7P SQL Tube Database Query

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2C40
Planar Triode

EIA Base & Outline

Substitute Data

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

Application

Source ........................................ RCA TT-5 - 1962
The 2C40 is a triode of lighthouse construction designed for use as an oscillator or radio-frequency amplifier 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 A Amplifier
Source ........................................ RCA TT-5 - 1962
Plate Voltage ................................. 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 200 Ω
Amplification Factor .......................... 36
Plate Resistance (approx) ..................... 7500 Ω
Transconductance .............................. 4800 µ
Plate Current ................................. 16.5 mA

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

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

(c) 1994-2021 by William A. Beech, NJ7P

Thu, 18 Aug 2022 16:14:12 -0700