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A horizontal ribbon.

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A horizontal ribbon.

12CT8
Medium-Mu Triode - Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 9DAEIA Bulb: 6-3
Source ........................................ ARRL HB - 1964

Application

Source ........................................ ARRL HB - 1964
Miniature type used as general purpose triode amplifier and pentode video amplifier. Requires miniature 9-contct socket.

Mechanical Data

Source ........................................ ARRL HB - 1964
Bulb .......................................... T-6 1/2
Base Type ..................................... Small Button 9-Pin
EIA Outline ................................... 6-2
EIA Base ...................................... 9DA
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ ARRL HB - 1964
Heater Voltage ................................ 12.6 V
Heater Current ................................ 0.3 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ ARRL HB - 1964
Input ......................................... 7.5 pf
Output ........................................ 2.4 pf
Grid to Plate ................................. 0.044 pf

Triode
Source ........................................ ARRL HB - 1964
Input ......................................... 2.4 pf
Output ........................................ 0.19 pf
Grid to Plate ................................. 2.2 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 2.5 W

Triode
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 300 V
Plate Dissipation ............................. 2.75 W
Grid No. 2 Dissipation ........................ 0.9 W

Characteristics and Typical Operation

Triode Class A Amplifier
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 150 V
Grid No. 1 Voltage ............................ -6.5 V
Amplification Factor .......................... 40
Plate Resistance (approx) ..................... 8.2K Ω
Transconductance .............................. 4400 µMho
Plate Current ................................. 9 mA

Pentode Class A Amplifier
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage ............................ -8 V
Plate Resistance (approx) ..................... 150K Ω
Transconductance .............................. 7000 µMho
Plate Current ................................. 15 mA
Grid No. 2 Current ............................ 3.4 mA

Triode Class A Amplifier
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 150 Ω
Amplification Factor .......................... 40
Plate Resistance (approx) ..................... 8.2K Ω
Transconductance .............................. 4900 µMho
Plate Current ................................. 9 mA

Pentode Class A Amplifier
Source ........................................ ARRL HB - 1964
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 82 Ω
Plate Resistance (approx) ..................... 150K Ω
Transconductance .............................. 7000 µMho
Plate Current ................................. 15 mA
Grid No. 2 Current ............................ 3.4 mA

A horizontal ribbon.

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A horizontal ribbon.

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Thu, 11 Aug 2022 12:55:04 -0700