What is the CK6336A vacuum tube?

The CK6336A is a triode vacuum tube designed for otl / regulator applications. Raytheon selected 6336A..

What is a CK6336A substitute or equivalent?

Direct equivalents to the CK6336A include 6336A / CK6336A family — check heater current and dissipation before substitution. 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 CK6336A?

Amplification factor μ ≈ 3, transconductance gm ≈ 13.5 mA/V, plate resistance rp ≈ 200 Ω, max plate voltage 400 V, max plate dissipation 30 W, heater 6.3 V / 5 A.

Is the CK6336A still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the CK6336A 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 CK6336A sound like?

Raytheon selected 6336A.. 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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CK6336A Triode Vacuum Tube

Dual triode6.3V / 5AOctalSPICE

SourceRaytheon CK6336A / 6336A datasheet — dual high-current power triode; corrected sections=2Reviewed2026-05-29StatusDataModelCalcModel2 enginesPDF

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

Datasheet ↗SPICE

CK6336A — Raytheon — triode vacuum tube — (1955)

200Ω

13.5mA/V

16.7pF

21.8pF

3.80pF

GAIN3%

POWER75%

DRIVE100%

LINEARITY95%

SPECIFICATIONS

Heater6.3 V · 5 A

Max Plate Voltage400 V

Pa max30 W

Gain Factor3

gm13.5 mA/V

rp200 Ω

Inter-electrode capacitances

Cgk16.7 pF

Cgp21.8 pF

Cpk3.8 pF

PinoutOctal

Era1955

RarityModerate

HEATER6.3V / 5A

MAX PLATE400V / 30W

BASEoctal

SECTIONS2 (dual)

Source datasheets

4 manufacturer datasheets cross-checked for CK6336A

4 verified

TYPICAL OPERATING POINT

SPICE model(2 available)2 .subckt available ↓

Va350V

Ia56.56mA

Vg-128.39025177495V

Pd19.8W

RL400Ω

Av3.3dB

EXECUTIVE SUMMARY

The CK6336A is a dual indirectly-heated triode from Raytheon, introduced around 1955. It provides a gain factor (μ) of 3 with 200Ω plate resistance. Commonly used in otl / regulator applications. Raytheon selected 6336A.

APPLICATIONS

SET outputPush-pull outputHeadphone outputPhase splitter

Generic triode otl / regulator stage

• Headphone amp• PA/public address

HISTORY

Introduced1955ManufacturerRaytheon

Golden Age

CK6336A Datasheet

Local mirror · PDF

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METRIX TESTER

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