What is the 7236 vacuum tube?

The 7236 is a triode vacuum tube designed for power/output applications. Computer-rated 5998. Clean, open sound..

What is a 7236 substitute or equivalent?

Direct equivalents to the 7236 include 5998A. 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 7236?

Amplification factor μ ≈ 5, transconductance gm ≈ 12.5 mA/V, plate resistance rp ≈ 432 Ω, max plate voltage 300 V, max plate dissipation 15 W, heater 6.3 V / 2.4 A.

Is the 7236 still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the 7236 as Sought-after 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 7236 sound like?

Computer-rated 5998. Clean, open sound.. 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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7236 Triode Vacuum Tube

Dual triode6.3V / 2.4AOctal

SourceTung-Sol 7236 datasheet (frank/pocnet)Reviewed2026-05-29StatusDataModelCalcModelunder reviewPDF

Power triode delivering 15W for push-pull and SET designs

Datasheet ↗

7236 — Tung-Sol·Sylvania — triode vacuum tube — (1957)

432Ω

12.5mA/V

9.0pF

10.0pF

3.30pF

GAIN5%

POWER38%

DRIVE100%

LINEARITY95%

SPECIFICATIONS

Heater6.3 V · 2.4 A

Max Plate Voltage300 V

Pa max15 W

Gain Factor5

gm12.5 mA/V

rp432 Ω

Inter-electrode capacitances

Cgk9 pF

Cgp10 pF

Cpk3.3 pF

PinoutOctal

Era1957

RaritySought-after

HEATER6.3V / 2.4A

MAX PLATE300V / 15W

BASEoctal

SECTIONS2 (dual)

Source datasheets

1 manufacturer datasheets cross-checked for 7236

1 verified

EXECUTIVE SUMMARY

The 7236 is a dual indirectly-heated triode from Tung-Sol·Sylvania, introduced around 1957. It provides a gain factor (μ) of 5 with 432Ω plate resistance. Commonly used in power/output applications. Computer-rated 5998. Clean, open sound.

APPLICATIONS

SET outputPush-pull outputHeadphone outputPhase splitter

Generic triode power/output stage

• Hi-Fi stereo• Headphone amp

HISTORY

Introduced1957ManufacturerTung-Sol·Sylvania

Golden Age

7236 Datasheet

Frank's Electron Tube Pages · 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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