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SV57210

Svetlana thoriated-tungsten power triode for high-power audio and linear service. Rated around 1 kV and 125 W dissipation, its low amplification factor favors high-current transformer-coupled output stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: UX4
Base pins: 4
Nominal heater: 6.3 V / 4 A

Description

Power triode, medium 4-pin base. Thoriated-tungsten filament, hard glass

Socket description

Medium-shell UX 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: UX4
Base pins: 4
Nominal heater voltage: 6.3 V
Nominal heater current: 4 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 2100 Ω
Transconductance: 0.0045 S
Amplification factor: 9.5
Max plate voltage: 1000 V
Max plate dissipation: 125 W
Max grid dissipation: 50 W
Max cathode current: 210 mA

Published ratings/characteristics promoted where unambiguous.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

199X Svetlana

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Voltage (AC or DC) 6.3 ±
0.3 V
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Current
4 A
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Plate resistance (nominal)
2100 ohms
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Grid to plate
5 pF
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Grid to filament
6.4 pF
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Other

DC plate voltage
1000 V
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Maximum-signal DC plate current
210 mA
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Plate Dissipation
125 W
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Grid Current
50 mA
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DC plate voltage 500
1000 V
TypicalOperation
Grid voltage -18
-61 V
TypicalOperation
DC Plate current, zero signal 80
100 mA
TypicalOperation
DC Plate current, max signal 110
150 mA
TypicalOperation
Plate load resistance 5000
5000 ohms
TypicalOperation
Power output at distortion above 9.5
46 W
TypicalOperation
DC Plate voltage 450
1000 V
TypicalOperation
Grid voltage -22
-70 V
TypicalOperation
DC Plate current, zero signal 150
200 mA
TypicalOperation
DC Plate current, max signal 240
280 mA
TypicalOperation
Plate load resistance 9600
9600 ohms
TypicalOperation
Vg =
80 v
TypicalOperation
Vg Vg =
0 v
TypicalOperation