Transcription of SVETLANA TECHNICAL DATA 3CX400A7/8874 High-Mu …
1 SVETLANA TECHNICAL data . 3CX400A7/8874 . High-Mu Power Triode T he SvetlanaTM 3CX400A7/8874 is a high performance ceramic/metal power triode designed for use in communications, paging and commercial service. The principal use is as an RF amplifier, in Class A, B or C. service. The SVETLANA 3CX400A7/8874 may also be operated as a pulse modula- tor with an increase in maximum plate voltage up to 3500 volts. Maximum plate current is 6 amps at a pulse duration of 100 microseconds. The SVETLANA 3CX400A7/8874 is a direct replacement for the model 3CX400A7/8874 manufactured in the United States. Characteristics SVETLANA Outline drawing Electrical B. Cathode: Oxide-coated unipotential J. Heater voltage (AC or DC) V K. Heater current @ A. Transconductance (average) 29,000 mhos Maximum frequency at full ratings 500 MHz Anode A.
2 Interelectrode capacitances, with cathode grounded: Input pF C. Output pF Grid (Contact F. Outer Cylindrical Grid-Plate pF Surface Only). G. Interelectrode capacitances, with grid grounded: Input pF. Output pF M. Plate-Cathode .03 pF. H. Mechanical Cooling Forced air Cathode = 1,2,3,8,9,10. Base 11 pin with ring EIA No. E11-81. Grid = 4,7,11. 6. Socket Johnson #124-311-100 Heater = 5,6 5 7. 4 8. Operating position- Vertical, base up or down 3 9. Nominal dimensions: 2 10. Diameter mm ( in.) 1 11. Length mm ( in). Maximum operating temperature 250 C. Net weight (average) 122 g ( lb.). Maximum ratings Dimensional data DC plate voltage 2200 V Dim. Millimeters Inches Min. Max. Min. Max. Maximum-signal DC plate current 350 mA. A Plate Dissipation 400 W B Grid Dissipation 5 W C F G.
3 H BASE: E11-81. (EIA DESIGNATION). J Headquarters: Marketing & Engineering: K . 8200 South Memorial Parkway 3000 Alpine Road M Huntsville, AL 35802 Portola Valley, CA 94028. USA USA. Phone: 205 882 1344 Phone: 415 233 0429. 7/97. Fax: 205 880 8077 Fax: 415 233 0439. SVETLANA ELECTRON DEVICES. SVETLANA 3CX400A7/8874 . High-Mu Power Triode Typical Operation, Class AB2 Cathode Driven Frequency in MHz DC plate voltage 30. 2000. 150. 2000. 432. 2000. SVETLANA ELECTRON DEVICES. V. Cathode voltage V. Peak RF grid-cathode voltage 67 50 67 V. Two tone plate current 312 245 300 mA. Zero signal plate current 22 10 22 mA. Two tone grid current 12 10 39 mA. Peak RF drivng power 26 18 27 W. Power output (approx.) 587 526 505 W. SVETLANA 3CX400A7/8874 . 120. Cooling data Typical Constant Current Characteristics Grounded Cathode Anode Plate Current - Amperes 100 Grid Current - Amperes Dissipation Air Flow Pressure Drop Watts CFM Inches of Water 200 80.
4 GRID VOLTAGE - VOLTS. 300 400 60. Heater/Cathode Operation 40. Frequency MHz Heater Voltage <300 301-400 20. 401-500 0 -20. 0 PLATE VOLTAGE - kV. SVETLANA 3CX400A7/8874 . -120 Typical Constant Current Characteristics Grounded Grid Plate Current - Amperes -100 Grid Current - Amperes -80. GRID VOLTAGE - VOLTS. -60. -40 -20 0 -20. 0 PLATE VOLTAGE - kV.
