What is the 6C41C vacuum tube?

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

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.

6C41C Triode Vacuum Tube

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

TriodeHeater 6.3 V · 3.1 A7-pin Soviet septar (oversized anode)Russian 1970

Plate dissipation: 25W
Max plate voltage: 450V
Transconductance: 19mA/V

6C41C

Characteristics

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

HeaterIndirectly heated

Specifications of 6C41C — Heater
Heater voltageVh	6.3 V
Heater currentIh	3.1 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of 6C41C — Limiting values
Plate voltageVa max	450 V
Plate dissipationPa max	25 W

Mechanical

Specifications of 6C41C — Mechanical
Base	7-pin Soviet septar (oversized anode)
Rarity	Moderate
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of 6C41C — Small signal
Transconductance	19 mA/V
Plate resistance	200 Ω
Amplification factor	4

Capacitances

Specifications of 6C41C — Capacitances
Grid–cathode	11 pF
Grid–plate	15 pF
Plate–cathode	6 pF

Charactereditorial reading, not a measurement

Specifications of 6C41C — Character
Gain	4%
Power	63%
Drive	100%
Linearity	95%

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

Using this tube

Interactive loadline calculator not available for this tube yet — it needs calibrated Koren or Ayumi parameters.

Applications

SET output
Push-pull output
Headphone output

Generic triode otl / regulator stage

Headphone amp

Replace or compare

Sources

By Jean-Michel Falligan DevergneReviewed May 29, 2026Source : Soviet-Tubes 6С41С datasheet

Manufacturer datasheets

1 manufacturer datasheets cross-checked for 6C41C1 verified

6C41C DatasheetLocal mirror · PDF

SPICE models

Revision and verification status

Source: Soviet-Tubes 6С41С datasheet
Reviewed: 2026-05-29
Status: DataModelCalc
Model: under review

Context

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.

History

Introduced: 1970
Manufacturer: Russian
Era: Late Production

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