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| SVETLANA TECHNICAL DATA SV6550C T High Performance Audio Beam Power Pentode he SvetlanaTM SV6550C is a glass envelope beam power pentode. It is intended for ultra linear audio frequency power amplification service. Close manufacturing specification tolerances and improved processing provide improved reliability and superior sonic performance. The new SV6550C features: increased peak cathode emission from new cathode materials; stable operation from extended processing and aging; gold-plated grid; new tri-plate anode; single-piece beam forming electrode; precise grid/screen alignment; improved vacuum processing; and comprehensive static and audio amplifier testing before and after aging. The Svetlana SV6550C is manufactured in the Svetlana factory in St. Petersburg, Russia, and is designed to be a direct replacement for any 6550. Characteristics Electrical Heater: Min. Nom. Max. Voltage (AC or DC) 5.7 6.3 6.9 V Current 1.6 A Cathode: Oxide-coated, unipotential Cathode-to-heater potential, max. -300*/200** V Direct interelectrode capacitances, max.*** Grid no.1 to cathode and grid no.3, grid no.2, base sleeve and heater 18.5 pF Plate to cathode and grid no.3, grid no.2, base sleeve and heater 12.5 pF Grid no.1 to plate (max) 1.1 pF Svetlana Outline drawing 2.05" max 4.72" max 4.17" max Mechanical Operating Position Base Maximum dimensions: Height Seated height Diameter Cooling Envelope Temperature (max) Approximate net weight Any Large wafer octal 8-pin with metal sleeve 116 mm (4.57 in.) 106 mm (4.173 in.) 46 mm (1.81 in.) Convection cooled 250C 100 g (3.5 oz.) 680 400 -300 175 35 6 V V V mA W W 1.77" max AF Power Amplifier, Maximum ratings DC plate voltage Grid no.2 DC (screen) voltage Grid no.1 (control) voltage DC cathode current Plate dissipation Grid no.2 (screen) dissipation *Max with heater negative to cathode **Max with heater positive to cathode ***Without external shielding Bottom View G2 4 P 3 2 1 External shield around base 8 C,BP 7 H G1 5 H Svetlana Svetlana SV6550C High Performance Audio Beam Power Pentode Typical Operation Class A1 (single tube) DC plate voltage Grid no.2 DC (screen) voltage Grid no.1 DC (control) voltage Peak AF grid no.1 (control) voltage Zero-signal plate current Max signal plate current Zero signal grid no.2 (screen) current Max signal grid no.2 (screen) current Transconductance (nominal) Load resistance Signal output at 5% distortion 400 225 -22 22 87 105 4 18 9500 3000 12 V V V V mA mA mAdc mA S ohms W Svetlana Svetlana SV6550C Typical Characteristics Screen Voltage = 250V Svetlana SV6550C Typical Characteristics Screen Voltage = 250V 200 screen current 400 plate current 0 175 350 SCREEN CURRENT (mA) ANODE CURRENT (mA) 150 300 -5 125 250 -10 100 200 -15 75 150 50 0 100 -20 25 -5 -10 -15 -25 50 -20 -25 0 0 100 200 300 400 0 600 500 0 100 200 300 400 500 600 PLATE VOLTAGE (Ep, V) PLATE VOLTAGE (Ep, V) www.svetlana-tubes.com |
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