What is the 6S3P-EV vacuum tube?

The 6S3P-EV is a triode vacuum tube designed for preamp applications. Russian frame-grid..

What are the key specifications of the 6S3P-EV?

Amplification factor μ ≈ 50, transconductance gm ≈ 19.5 mA/V, plate resistance rp ≈ 2.6 kΩ, max plate voltage 160 V, max plate dissipation 3 W, heater 6.3 V / 0.3 A.

Is the 6S3P-EV still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the 6S3P-EV as Moderate 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 6S3P-EV sound like?

Russian frame-grid.. 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.

6S3P-EV Triode Vacuum Tube

Medium-gain triode for driver and line stage applications

Dual triodeHeater 6.3 V · 0.3 A9-pin Noval2 sectionsRussian 1965

Plate dissipation: 3W
Max plate voltage: 160V
Amplification factor: 50
Transconductance: 19.5mA/V
Plate resistance: 2.564kΩ

6S3P-EV

Characteristics

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

HeaterIndirectly heated

Specifications of 6S3P-EV — Heater
Heater voltageVh	6.3 V
Heater currentIh	0.3 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of 6S3P-EV — Limiting values
Plate voltageVa max	160 V
Plate dissipationPa max	3 W

Mechanical

Specifications of 6S3P-EV — Mechanical
Base	9-pin Noval
Rarity	Moderate
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of 6S3P-EV — Small signal
Transconductance	19.5 mA/V
Plate resistance	2.6 kΩ
Amplification factor	50

Capacitances

Specifications of 6S3P-EV — Capacitances
Grid–cathode	6.9 pF
Grid–plate	2.2 pF
Plate–cathode	1.65 pF

Charactereditorial reading, not a measurement

Specifications of 6S3P-EV — Character
Gain	50%
Power	8%
Drive	97%
Linearity	75%

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

Using this tube

Applications

Voltage amplifier
Phase splitter

Generic triode preamp stage

Hi-Fi stereoHeadphone amp

Replace or compare

Sources

By Jean-Michel Falligan DevergneReviewed May 29, 2026Source : Soviet-Tubes 6С3П-ЕВ · 417A/EC86 familyActive model : Norman Koren

Manufacturer datasheets

1 manufacturer datasheets cross-checked for 6S3P-EV1 verified

6S3P-EV DatasheetLocal mirror · PDF

SPICE models

Revision and verification status

Source: Soviet-Tubes 6С3П-ЕВ · 417A/EC86 family
Reviewed: 2026-05-29
Status: DataModelCalc
Model: Norman Koren

Context

The 6S3P-EV is a dual indirectly-heated triode from Russian, introduced around 1965. It provides a gain factor (μ) of 50 with 2564Ω plate resistance. Commonly used in preamp applications. Russian frame-grid.

History

Introduced: 1965
Manufacturer: Russian
Era: Late Production

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