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.

CK6336A Triode Vacuum Tube

Also known as 6336A · CK6336A family — check heater current and dissipation before substitution

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

Dual triodeHeater 6.3 V · 5 AOctal2 sectionsRaytheon 1955

Plate dissipation: 30W
Max plate voltage: 400V
Transconductance: 13.5mA/V

CK6336A

Characteristics

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

HeaterIndirectly heated

Specifications of CK6336A — Heater
Heater voltageVh	6.3 V
Heater currentIh	5 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of CK6336A — Limiting values
Plate voltageVa max	400 V
Plate dissipationPa max	30 W

Mechanical

Specifications of CK6336A — Mechanical
Base	Octal
Rarity	Moderate
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of CK6336A — Small signal
Transconductance	13.5 mA/V
Plate resistance	200 Ω
Amplification factor	3

Capacitances

Specifications of CK6336A — Capacitances
Grid–cathode	16.7 pF
Grid–plate	21.8 pF
Plate–cathode	3.8 pF

Charactereditorial reading, not a measurement

Specifications of CK6336A — Character
Gain	3%
Power	75%
Drive	100%
Linearity	95%

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

Using this tube

Applications

SET output
Push-pull output
Headphone output
Phase splitter

Generic triode otl / regulator stage

Headphone ampPA/public address

Replace or compare

Sources

By Jean-Michel Falligan DevergneReviewed May 29, 2026Source : Raytheon CK6336A / 6336A datasheet — dual high-current power triode; corrected sections=2Active model : Ayumi Nakabayashi · 2 engines

Manufacturer datasheets

4 manufacturer datasheets cross-checked for CK6336A4 verified

CK6336A DatasheetLocal mirror · PDF

SPICE models

Revision and verification status

Source: Raytheon CK6336A / 6336A datasheet — dual high-current power triode; corrected sections=2
Reviewed: 2026-05-29
Status: DataModelCalc
Model: Ayumi Nakabayashi · 2 engines

Context

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.

History

Introduced: 1955
Manufacturer: Raytheon
Era: Golden Age

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