What is the SV572-10 vacuum tube?

The SV572-10 is a triode vacuum tube designed for transmitting (set) applications. Svetlana power triode..

What is a SV572-10 substitute or equivalent?

Direct equivalents to the SV572-10 include 572B family (no exact equivalent — NOT a GM70). These share the same pinout and operating envelope, so they can usually be swapped without circuit changes — though batch-to-batch variations between manufacturers (NOS vs current production) may shift the sonic character noticeably.

What are the key specifications of the SV572-10?

Amplification factor μ ≈ 10, transconductance gm ≈ 4.5 mA/V, plate resistance rp ≈ 2.1 kΩ, max plate voltage 1000 V, max plate dissipation 125 W, heater 6.3 V / 4 A.

Is the SV572-10 still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the SV572-10 as Sought-after availability. NOS (new-old-stock) examples from RCA, Mullard, Tung-Sol, GE, Sylvania and Telefunken trade among collectors; modern production where it exists comes mostly from JJ Electronic, Electro-Harmonix, Tung-Sol (New Sensor), Genalex, and a handful of small-batch makers.

What does the SV572-10 sound like?

Svetlana power triode.. Sonic character also depends heavily on the circuit operating point, the surrounding tubes in the stage, and the output transformer when present — use the interactive loadline calculator on this page to explore the trade-offs.

By Jean-Michel Falligan Devergne · Reviewed May 29, 2026

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SV572-10 Triode Vacuum Tube

Triode6.3V / 4AUX-4SPICE

SourceSvetlana SV572-10 via EHX · cap audit 2026-05-09Reviewed2026-05-29StatusDataModelCalcModelNorman KorenPDF

Power triode delivering 125W for push-pull and SET designs

Datasheet ↗SPICE

SV572-10 — Svetlana — triode vacuum tube — (1995)

2.1kΩ

4.5mA/V

6.4pF

5.0pF

4.00pF

GAIN10%

POWER100%

DRIVE98%

LINEARITY95%

SPECIFICATIONS

Heater6.3 V · 4 A

Max Plate Voltage1000 V

Pa max125 W

Gain Factor10

gm4.5 mA/V

rp2.1 kΩ

Inter-electrode capacitances

Cgk6.4 pF

Cgp5 pF

Cpk4 pF

PinoutUX-4

Era1995

RaritySought-after

HEATER6.3V / 4A

MAX PLATE1000V / 125W

BASEux4

Source datasheets

1 manufacturer datasheets cross-checked for SV572-10

1 verified

TYPICAL OPERATING POINT

Va900V

Ia74.13mA

Vg-60V

Pd66.72W

RL5kΩ

Av15.8dB

EXECUTIVE SUMMARY

The SV572-10 is a modern directly-heated triode designed and manufactured by Svetlana specifically for audio amplifier use, with no direct vintage equivalent. With a mu of approximately 4.5 and plate dissipation of 60W, it can deliver 15-20W in single-ended Class A with a warm, full-bodied sonic character. Unlike vintage transmitting triodes, it was engineered from the start for audio linearity rather than being adapted from RF service. The mesh plate construction and moderate operating voltages (600-800V) make it more practical to implement than 211/845 types while offering similar power levels.

APPLICATIONS

SET outputPush-pull output

Generic triode transmitting (set) stage

• Headphone amp• PA/public address

HISTORY

Introduced1995ManufacturerSvetlana

Modern

SV572-10 Datasheet

Frank's Electron Tube Pages · PDF

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METRIX TESTER

Test this tube on a Metrix

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