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Tube Tinker — Electron Tube Database
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Power - Triode ·Triode

SV300B

Svetlana reproduction of the classic directly heated 300B audio power triode. With about 40 W plate dissipation and low plate resistance, it is optimized for high-quality single-ended Class A audio output.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
UX4
Base pins
4
Nominal heater
5 V / 1.2 A

Description

Power triode, medium 4-pin base. Exact duplicate of original version, with same

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
5 V
Nominal heater current
1.2 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
700 Ω
Transconductance
0.0055 S
Amplification factor
3.85
Max plate voltage
450 V
Max plate dissipation
40 W
Max cathode current
100 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) 5.0±

    0.3 V

    SourcePage1-2

  • Current

    1.2 A

    SourcePage1-2

  • Plate resistance

    700 ohms

    SourcePage1-2

  • Grid to plate

    15 pF

    SourcePage1-2

  • Grid to filament

    9 pF

    SourcePage1-2

Other

  • DC plate voltage

    450 V

    SourcePage1-2

  • Plate dissipation

    40 W

    SourcePage1-2

  • Plate voltage

    450 V

    TypicalOperation

  • Grid voltage

    -100 V

    TypicalOperation

  • Plate current, no signal

    60 mA

    TypicalOperation

  • Plate current, max signal

    65 mA

    TypicalOperation

  • Effective load resistance

    5500 ohms

    TypicalOperation

  • Distortion at 1 watt into

    8 ohms

    TypicalOperation

  • Power output at 5% distortion

    10 W

    TypicalOperation

  • Vg =

    0 V

    TypicalOperation

  • Vg =

    -160 V

    TypicalOperation