What is the 6S3P-EV vacuum tube?

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

What is a 6S3P-EV substitute or equivalent?

Direct equivalents to the 6S3P-EV include None. 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 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.

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

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6S3P-EV Triode Vacuum Tube

Dual triode6.3V / 0.3A9-pin NovalSPICE

SourceSoviet-Tubes 6С3П-ЕВ · 417A/EC86 familyReviewed2026-05-29StatusDataModelCalcModelNorman KorenPDF

Medium-gain triode for driver and line stage applications

Datasheet ↗SPICE

6S3P-EV — Russian — triode vacuum tube — (1965)

2.6kΩ

19.5mA/V

6.9pF

2.2pF

1.65pF

GAIN50%

POWER8%

DRIVE97%

LINEARITY75%

SPECIFICATIONS

Heater6.3 V · 0.3 A

Max Plate Voltage160 V

Pa max3 W

Gain Factor50

gm19.5 mA/V

rp2.6 kΩ

Inter-electrode capacitances

Cgk6.9 pF

Cgp2.2 pF

Cpk1.65 pF

Pinout9-pin Noval

Era1965

RarityModerate

HEATER6.3V / 0.3A

MAX PLATE160V / 3W

BASEnoval

SECTIONS2 (dual)

Source datasheets

1 manufacturer datasheets cross-checked for 6S3P-EV

1 verified

TYPICAL OPERATING POINT

Va90V

Ia0.06mA

Vg-2.5V

Pd0.01W

RL3kΩ

Av1.7dB

EXECUTIVE SUMMARY

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.

APPLICATIONS

Voltage amplifierPhase splitter

Generic triode preamp stage

• Hi-Fi stereo• Headphone amp

HISTORY

Introduced1965ManufacturerRussian

Late Production

6S3P-EV Datasheet

Local mirror · PDF

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METRIX TESTER

Test this tube on a Metrix

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