SVETLANA TECHNICAL DATA

KT88
High Performance Audio
Beam Power TetrodeThe Svetlana™ KT88 is a glass envelope beam power tetrode. It is intended foraudio 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 cathodeemission from new cathode materials; Stable operation from extended processing andaging; Gold-plated grid; New tri-plate anode; Single-piece beam forming electrode;
Precise grid/screen alignment; Improved vacuum processing; comprehensive staticand audio amplifier testing before and after aging.

Svetlana Outline drawing

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**
VDirect 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 height103.5 mm (4.08 in.)
Diameter
51 mm (2.0 in.)
Cooling
Convection cooled
Envelope Temperature (max)250˚CApproximate net weight
90 g (3.0 oz.)*Max with heater negative to cathode

ELECTRON DEVICES

KT88**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

800600-300
230
428

Headquarters:
8200 South Memorial Parkway
Huntsville, AL 35802
USAPhone:
256 882 1344
Fax:
256 880 8077

Svetlana
ELECTRON DEVICES

www.svetlana.com

VVV
mA
W
W

43mm

Marketing & Engineering:3000 Alpine Road
Portola Valley, CA 94028
USA
Phone:
650 233 0429
Fax:
650 233 0439
10/99117mm

Svetlana

103.5mm

84mm

51mm

Svetlana KT88
High Performance Audio
Beam Power Tetrode

Svetlana
ELECTRON DEVICES

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
V225
V-16.5
V
16.5
V
87mA
105mA
4 mAdc18mA11.5 mA/Volt
19W

400

+10Svetlana KT88
Typical Performance Curves
Triode Connection0V=Eg

Plate Current-10Plate Current-5-10300
PLATE CURRENT (Ip, mA)

PLATE CURRENT (Ip, mA)

Svetlana KT88
Typical Performance Curves
Vscreen = 300 V

Eg = 0 V

400-15-20

200

-20

-30
-40

300

-50-60 -70-800-100-12200

0-14100-25-30

100

0-35

250

0500

750

10001250

PLATE VOLTAGE (Ep,V)

-40

00

250

500

750

1000

1250

1500

PLATE VOLTAGE (Ep, V)

400

Eg = 0 V

Svetlana KT88
Typical Performance Curves
Ultralinear Connection, 40% taps
Plate Current
Screen Current-5Plate Current+5Eg = 0 V200150-5100-1050-15-2000250

500-10750

1000-15

PLATE CURRENT (Ip, mA)

PLATE CURRENT (Ip, mA)

Svetlana KT88
Typical Performance Curves
Vscreen = 140 V

300-20-25-30

200-35-40-45-50

100-551250

PLATE VOLTAGE (Ep,V)

0-60

screen current at
0 V grid voltage
1000
PLATE VOLTAGE (Ep, V)

200

300

400

500

295
255
SCREEN VOLTAGE (Ep, V)

335

375

415

455

www.svetlana.com