Svetlana 3CX10,000A7/8160

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1 Svetlana 3CX1,A7/816 High-Mu Power Triode T he Svetlana 3CX1,A7/816 is a high-performance ceramic/metal power triode designed for use in zero-bias, class B RF or audio amplifiers. A modern mesh filament is used, replacing the old-fashioned hairpin construction. The improved mesh filament design ensures better mechanical rigidity and long lasting concentricity of the filament, providing enhanced linearity, less noise, reduced warm-up variation and longer life. The lowinductance, mesh-filament basket also forms a natural extension of the cylindrical stem geometry into the active area, giving superior VHF performance. The Svetlana 3CX1,A7/816 is manufactured in the Svetlana Electron Devices complex in St. Petersburg, Russia. Svetlana has achieved the improved performance described above with exact replacement compatibility with the 3CX1,A7/816 manufactured in the United States. Svetlana ELECTRON DEVICES

2 Svetlana 3CX1,A7/816 General Characteristics Electrical Filament Thoriated-tungsten mesh Voltage 7.5 ±.37V 7.5V 1A Amplification factor (average) 2 Direct interelectrode capacitances (grounded grid): Input 59.pF Output 36.pF Feedback.2pF Direct interelectrode capacitances (grounded filament): Input 59.pF Output.2pF Feedback 36.pF Maximum frequency for full ratings (CW) 16 MHz Mechanical Cooling Forced air Base Coaxial Socketing Eimac 13 or equiv. Air chimney Eimac 136 or equiv. Operating position Vertical, Base up or down Maximum operating temperature 25 C Maximum dimensions: Length mm (8.75 in.) Diameter mm (7.5 in.) Net weight 5.45 kg (12 lb) Cathode-Driven Radio Frequency Linear Amplifier, Class B Maximum Ratings DC plate voltage 1, V DC plate current 5. A Plate dissipation 12 kw Grid dissipation 5 W Typical operation DC plate voltage 7 7 V Zero-signal DC plate current*.6.6 A Single-tone DC plate current A Grid bias V Single-tone DC grid current* A Peak driving power W Single-tone plate output power kw Resonant load impedance Ohms Driving impedance Ohms *Approximate values

3 High-Mu Power Triode Cathode-Driven Class C RF Amplifier, CW or FM Maximum Ratings DC plate voltage 1, V DC plate current 4. A Plate dissipation 1 kw Grid dissipation 5 W Typical operation DC plate voltage 76 V DC grid voltage -11 V DC plate current 3.68 A DC grid current*.78 A Peak RF cathode voltage* 4 V Driving power* 151 W Plate output power 22.5 kw Audio Frequency Amplifier or Modulator, Class AB 2 Grid Driven Maximum ratings (per tube) DC plate voltage 8 V DC plate current 5. A Plate dissipation 12 kw Grid dissipation 5 W Typical operation (two tubes, sinusoidal waveform) DC plate voltage 7 7 Vdc DC grid voltage V Zero-signal DC plate current* A Maximum-signal DC plate current A Maximum-signal DC grid current* A Peak AF grid voltage** V Peak driving power W Plate output power kw Load resistance (plate-to-plate) Ohms *Approximate Values **Per tube

4 3CX1,A7/816 3CX1,A7/816 Outline Drawing A Dimensional Data Dim. Millimeters Inches B Min. Max. Min. Max. T* A B C P S N* Anode D E F H Air J M M R J* H* C Do not contact Grid Filament Do not contact N P R S T D E F * Contact surface

5 High-Mu Power Triode Electrical Application Filament Operation The rated filament voltage for the 3CX1,A7/816 is 7.5 volts. Filament voltage, as measured at the socket, should be maintained within 5% of this value to obtain maximum tube life. Input Circuit A resonant tank circuit is recommended for grounded-grid operation. In a single-ended circuit the loaded Q should be at least 3. This technique increases linearity and output power. Mechanical Application Mounting The 3CX1,A7/816 must be mounted with its axis vertical. The base of the tube may be up or down. Cooling Sufficient forced-air circulation must be provided to keep the temperature of the anode core and the temperatures of the ceramic/metal seals below 225 C. Airflow requirements to maintain these temperatures below 225 C with an inlet-air temperature of 5 C are tabulated. At frequencies above 3 MHz or at higher inlet-air temperatures, more airflow will be required. Base-to-Anode Air Flow * Sea Level 1, Feet Anode Dissipation Air Flow Pressure Drop Air Flow Pressure Drop Watts CFM Inches of Water CFM Inches of Water , * Because the power dissipated by the filament represents about 75 watts and because grid dissipation can, under some conditions, represent another 5 watts, allowance has been made in preparing this tabulation for an additional 125 watts.

6 3CX1,A7/ Svetlana 3CX1,A7/816 Typical Plate Charicteristics Plate Current - Amperes Grid Current - Amperes Grid Voltage = 4 Volts PLATE VOLTAGE (KILOVOLTS) CURRENT (AMPERES) Grid Voltage = 4 Volts

7 High-Mu Power Triode A Svetlana 3CX1,A7/816 Typical Constant Current Charicteristics Grounded-grid Plate Current - Amperes Grid Current - Amperes A PLATE-TO-GRID VOLTAGE (KILOVOLTS) FILAMENT-TO-GRID VOLTAGE (VOLTS)