Philips SV6550C DATASHEETS
SVETLANA TECHNICAL DATA
2.05" max
1.77" max
4.17" max
4.72" max
SV6550C
High Performance Audio Beam
Power Pentode
he Svetlana™ SV6550C is a glass envelope beam power pentode. It is intended for
T
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
Mechanical
Operating Position Any
Base Large wafer octal 8-pin with metal sleeve
Maximum dimensions:
Height 116 mm (4.57 in.)
Seated height 106 mm (4.173 in.)
Diameter 46 mm (1.81 in.)
Cooling Convection cooled
Envelope Temperature (max) 250˚C
Approximate net weight 100 g (3.5 oz.)
AF Power Amplifier, Maximum ratings
DC plate voltage 680 V
Grid no.2 DC (screen) voltage 400 V
Grid no.1 (control) voltage -300 V
DC cathode current 175 mA
Plate dissipation 35 W
Grid no.2 (screen) dissipation 6 W
*Max with heater negative to cathode
**Max with heater positive to cathode
***Without external shielding
Headquarters:
8200 South Memorial Parkway
Huntsville, AL 35802
USA
Phone: 205 882 1344
Fax: 205 880 8077
Marketing & Engineering:
3000 Alpine Road
Portola Valley, CA 94028
USA
Phone: 415 233 0429
Fax: 415 233 0439
Svetlana Outline drawing
Bottom View
G2
P
3
2
H
External shield
around base
G1
5
4
7
1
8
C,BP
H
Svetlana
ELECTRON DEVICES
www.svetlana.com
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Svetlana SV6550C
High Performance Audio
Beam Power Pentode
Typical Operation Class A1 (single tube)
DC plate voltage 400 V
Grid no.2 DC (screen) voltage 225 V
Grid no.1 DC (control) voltage -22 V
Peak AF grid no.1 (control) voltage 22 V
Zero-signal plate current 87 mA
Max signal plate current 105 mA
Zero signal grid no.2 (screen) current 4 mAdc
Max signal grid no.2 (screen) current 18 mA
Transconductance (nominal) 9500
Load resistance 3000 ohms
Signal output at 5% distortion 12 W
µ
Svetlana
ELECTRON DEVICES
S
SCREEN CURRENT (mA)
200
175
150
125
100
75
50
25
Svetlana SV6550C
Typical Characteristics
Screen Voltage = 250V
screen current
0
-5
-10
-15
-20
0
100
0
200 300 400 500 600
-25
ANODE CURRENT (mA)
400
350
300
250
200
150
100
50
0
100
0
200 300 400 500 600
Svetlana SV6550C
Typical Characteristics
Screen Voltage = 250V
plate current
0
-5
-10
-15
-20
-25
PLATE VOLTAGE (Ep, V)
PLATE VOLTAGE (Ep, V)
www.svetlana.com
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