What is the 6C41C vacuum tube?

The 6C41C is a triode vacuum tube designed for otl / regulator applications. Russian OTL output..

What is a 6C41C substitute or equivalent?

Direct equivalents to the 6C41C 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 6C41C?

Amplification factor μ ≈ 4, transconductance gm ≈ 19 mA/V, plate resistance rp ≈ 200 Ω, max plate voltage 450 V, max plate dissipation 25 W, heater 6.3 V / 3.1 A.

Is the 6C41C still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the 6C41C 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 6C41C sound like?

Russian OTL output.. 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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6C41C Triode Vacuum Tube

Triode6.3V / 3.1A7-pin Soviet septar (oversized anode)

SourceSoviet-Tubes 6С41С datasheetReviewed2026-05-29StatusDataModelCalcModelunder reviewPDF

High-power directly-heated triode for single-ended amplification

Datasheet ↗

6C41C — Russian — triode vacuum tube — (1970)

200Ω

19.0mA/V

11.0pF

15.0pF

6.00pF

GAIN4%

POWER63%

DRIVE100%

LINEARITY95%

SPECIFICATIONS

Heater6.3 V · 3.1 A

Max Plate Voltage450 V

Pa max25 W

Gain Factor4

gm19 mA/V

rp200 Ω

Inter-electrode capacitances

Cgk11 pF

Cgp15 pF

Cpk6 pF

Pinout7-pin Soviet septar (oversized anode)

Era1970

RarityModerate

HEATER6.3V / 3.1A

MAX PLATE450V / 25W

BASE6c33

Source datasheets

1 manufacturer datasheets cross-checked for 6C41C

1 verified

EXECUTIVE SUMMARY

The 6C41C is a indirectly-heated triode from Russian, introduced around 1970. It provides a gain factor (μ) of 4 with 200Ω plate resistance. Commonly used in otl / regulator applications. Russian OTL output.

APPLICATIONS

SET outputPush-pull outputHeadphone output

Generic triode otl / regulator stage

• Headphone amp

HISTORY

Introduced1970ManufacturerRussian

Late Production

6C41C Datasheet

Local mirror · PDF

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METRIX TESTER

Test this tube on a Metrix

SPICE model not yet available. Loadline calculator requires calibrated Koren parameters.

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