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.

SV572-10 Triode Vacuum Tube

Also known as 572B family (no exact equivalent — NOT a GM70)

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

TriodeHeater 6.3 V · 4 AUX-4Svetlana 1995

Plate dissipation: 125W
Max plate voltage: 1000V
Transconductance: 4.5mA/V

SV572-10

Characteristics

Datasheet values, once each. Every value cites its sheet.

HeaterDirectly heated

Specifications of SV572-10 — Heater
Heater voltageVh	6.3 V
Heater currentIh	4 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of SV572-10 — Limiting values
Plate voltageVa max	1000 V
Plate dissipationPa max	125 W

Mechanical

Specifications of SV572-10 — Mechanical
Base	UX-4
Rarity	Sought-after
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of SV572-10 — Small signal
Transconductance	4.5 mA/V
Plate resistance	2.1 kΩ
Amplification factor	10

Capacitances

Specifications of SV572-10 — Capacitances
Grid–cathode	6.4 pF
Grid–plate	5 pF
Plate–cathode	4 pF

Charactereditorial reading, not a measurement

Specifications of SV572-10 — Character
Gain	10%
Power	100%
Drive	98%
Linearity	95%

datasheet cited · model or editorial reading · catalogue value, no citation attached yet · nothing invented

Using this tube

Applications

SET output
Push-pull output

Generic triode transmitting (set) stage

Headphone ampPA/public address

Replace or compare

Sources

By Jean-Michel Falligan DevergneReviewed May 29, 2026Source : Svetlana SV572-10 via EHX · cap audit 2026-05-09Active model : Norman Koren

Manufacturer datasheets

1 manufacturer datasheets cross-checked for SV572-101 verified

SV572-10 DatasheetFrank's Electron Tube Pages · PDF

SPICE models

Revision and verification status

Source: Svetlana SV572-10 via EHX · cap audit 2026-05-09
Reviewed: 2026-05-29
Status: DataModelCalc
Model: Norman Koren

Context

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.

History

Introduced: 1995
Manufacturer: Svetlana
Era: Modern

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