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SV81110

Svetlana thoriated-tungsten 811-family power triode optimized for low-mu linear audio service. Rated around 800 V and 65 W dissipation, its characteristics suit high-current audio power 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: 2500 Ω
Transconductance: 0.0038 S
Amplification factor: 10
Max plate voltage: 800 V
Max plate dissipation: 65 W
Max grid dissipation: 50 W
Max cathode current: 160 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
SourcePage1-2
Current
4 A
SourcePage1-2
Plate resistance
2500 ohms
SourcePage1-2
Grid to plate
8 pF
SourcePage1-2
Grid to filament
7 pF
SourcePage1-2

Other

DC plate voltage
800 V
SourcePage1-2
Maximum-signal DC plate current
160 mA
SourcePage1-2
Grid Current
50 mA
SourcePage1-2
DC plate voltage 450
800 V
TypicalOperation
Grid voltage -9
-45 V
TypicalOperation
Peak grid drive 110
127 V
TypicalOperation
DC Plate current, zero signal 80
80 mA
TypicalOperation
DC Plate current, max signal 100
91 mA
TypicalOperation
Plate load resistance 5000
5000 ohms
TypicalOperation
Power output at distortion above 8.3
13.4 W
TypicalOperation
Grid voltage -16.5
-51 V
TypicalOperation
Peak grid drive, grid-to-grid 360
420 V
TypicalOperation
DC Plate current, zero signal (per tube) 150
150 mA
TypicalOperation
DC Plate current, max signal (per tube) 250
260 mA
TypicalOperation
Plate load resistance 9600
9600 ohms
TypicalOperation
Power output at distortion above 41
91 W
TypicalOperation