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.

7236 Triode Vacuum Tube

Also known as 5998A

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

Dual triodeHeater 6.3 V · 2.4 AOctal2 sectionsTung-Sol·Sylvania 1957

Plate dissipation: 15W
Max plate voltage: 300V
Transconductance: 12.5mA/V

7236

Characteristics

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

HeaterIndirectly heated

Specifications of 7236 — Heater
Heater voltageVh	6.3 V
Heater currentIh	2.4 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of 7236 — Limiting values
Plate voltageVa max	300 V
Plate dissipationPa max	15 W
Grid resistorRg1 max	250 kΩ
Heater–cathode voltageVhk max	100 V

Mechanical

Specifications of 7236 — Mechanical
Base	Octal
Rarity	Sought-after
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of 7236 — Small signal
Transconductance	12.5 mA/V
Plate resistance	432 Ω
Amplification factor	5

Capacitances

Specifications of 7236 — Capacitances
Grid–cathode	9 pF
Grid–plate	10 pF
Plate–cathode	3.3 pF

Charactereditorial reading, not a measurement

Specifications of 7236 — Character
Gain	5%
Power	38%
Drive	100%
Linearity	95%

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

Using this tube

No interactive loadline model for this tube yet — download a SPICE model below to simulate it in LTspice or ngspice.

Applications

SET output
Push-pull output
Headphone output
Phase splitter

Generic triode power/output stage

Hi-Fi stereoHeadphone amp

Replace or compare

Sources

By Jean-Michel Falligan DevergneReviewed May 29, 2026Source : Tung-Sol 7236 datasheet (frank/pocnet)

Manufacturer datasheets

1 manufacturer datasheets cross-checked for 72361 verified

7236 DatasheetFrank's Electron Tube Pages · PDF

SPICE models

Revision and verification status

Source: Tung-Sol 7236 datasheet (frank/pocnet)
Reviewed: 2026-05-29
Status: DataModelCalc
Model: under review

Context

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.

History

Introduced: 1957
Manufacturer: Tung-Sol·Sylvania
Era: Golden Age

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