Precise grid/screen alignment; Improved vacuum processing; comprehensive static and audio amplifier testing before and after aging. Electrical. Heater: Min.
he Svetlana™ KT88 is a glass envelope beam power tetrode. It is intended for audio frequency power amplification service. High plate dissipation rating, close manufacturing specification tolerances and thorough processing provides improved reliability and superior sonic performance. The Svetlana KT88 is manufactured in the Svetlana factory in St. Petersburg, Russia, and is designed to be a direct replacement for any KT88, KT90, KT99 or 6550. The new KT88 features greatly enhanced sonic performance: 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; comprehensive static and audio amplifier testing before and after aging.
Svetlana Outline drawing
*Max with heater negative to cathode
**Max with heater positive to cathode
***Without external shielding
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
Svetlana
800 600 -300 230 42 8
V V V mA W W
43mm
117mm
103.5mm
51mm
84mm
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. -250*/250** V Direct interelectrode capacitances*** Grid no.1 to cathode and grid no.3, grid no.2, base sleeve and heater 16.0 pF Plate to cathode and grid no.3, grid no.2, base sleeve and heater 12.0 pF Grid no.1 to plate 1.2 pF Mechanical Operating Position Any Base Large wafer octal 8-pin with metal sleeve Nominal dimensions: Height 117 mm (4.61 in.) Seated height 103.5 mm (4.08 in.) Diameter 51 mm (2.0 in.) Cooling Convection cooled Envelope Temperature (max) 250˚C Approximate net weight 90 g (3.0 oz.)
Svetlana KT88 High Performance Audio Beam Power Tetrode 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 Signal output
400 V 225 V -16.5 V 16.5 V 87 mA 105 mA 4 mAdc 18 mA 11.5 mA/Volt 19 W
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