Philips KT88 DATASHEETS
KT88 BEAM POWER
TETRODE
The Svetlana™ KT88 is a beam power tetrode having
a large standard octal base and glass envelope. With a
gold-plated molybdenum alloy grid and carbon -coated
screen grid, the Svetlana KT88 is the finest power tube
of its type being manufactured today. Its exclusive
screen-grid radiator fins reduce a major source of
failure in audio amplifiers, especially when operated in
ultralinear or triode connection. All ratings of the
Svetlana KT88 meet or exceed those of the original
version; top-quality cathode materials and extensive
aging yield outstanding performance in high -fidelity
amplifiers. The Svetlana KT88 is made exclusively at
the Svetlana Electron Devices factory in St. Petersburg,
Russia, and is marketed worldwide by PM Compon ents
Ltd. and in the USA by PM of America Inc.
TYPICAL MECHANICAL AND ELECTRICAL PARAMETERS
Exact replacement for: 6550, 6550A, KT88, KT90,
KT99, KT100
Heater: 6.3v AC or DC, 1.65 amps
Cathode: oxide-coated high -purity nickel sleeve
Capacitances:
control grid to anode 1.4 pF
control grid to cathode 16.5 pF
Mounting and basing large octal, metal ring conn. to pin 1,
device operable in any position
Height 120 mm (4.7 in)
Diameter 52 mm (2.0 in)
Mass 95 g (3.4 oz)
____________________________________________________________
HEADQUARTERS: CERAMIC TUBE DIVISION:
1687 Shelby Oaks Drive 895 B. Street PMB #481
Suite 8 Hayward, CA 94541
Memphis, TN 38134 Phone / Fax: 510-885-1247
Phone: 901-388-2424
Fax: 901-388-2405
www.svetlanausa.com
ABSOLUTE MAXIMUM RATINGS
Cathode-heater maximum DC voltage +-250v
Allowable spot temperature on envel. 250 degrees C
Plate voltage, DC (at idle) 820 v
Plate voltage, DC, in triode connection 610 v
Screen voltage, DC, at idle 610 v
Control grid v oltage, DC, at idle -350 v
Cathode current, DC, at idle 235 mA
Plate dissipation, peak or idle 44 watts
Screen grid dissipation, peak or idle 10 watts
Control grid resistance, fixed bias 220k ohms
TYPICAL OPERATION
Push -pull class AB1 tetrode connection, cathode bias
Plate voltage 560v DC
Screen voltage 300v DC
Plate current, idle 120 mA
Plate current, full power 150 mA
Cathode bias resistor, common 350 ohms 25w
Load resistance, plate-to-plate 9000 ohms
Output power 50 watts
Total harmonic distortion at 50w output 3%
Push -pull class AB1 tetrode connection, fixed bias
Plate voltage 560v DC
Screen voltage 300v DC
Plate current, idle 120 mA
Plate current, full power 290 mA
Grid bias -45 v DC
Load resistance, plate-to-plate 4500 ohms
Output power 100 watts
Total harmonic distortion at 100w out 2.5%
____________________________________________________________
HEADQUARTERS: CERAMIC TUBE DIVISION:
1687 Shelby Oaks Drive 895 B. Street PMB #481
Suite 8 Hayward, CA 94541
Memphis, TN 38134 Phone / Fax: 510-885-1247
Phone: 901-388-2424
Fax: 901-388-2405
www.svetlanausa.com
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