What is the QQE03-10 vacuum tube?

The QQE03-10 (QQE03/10) is a tetrode vacuum tube designed for transmitting applications. Push-pull beam in one envelope..

What is a QQE03-10 substitute or equivalent?

Direct equivalents to the QQE03-10 include None. 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 QQE03-10?

Amplification factor μ ≈ 8, transconductance gm ≈ 3.3 mA/V, max plate voltage 300 V, max plate dissipation 7 W, heater 6.3 V / 0.82 A.

Is the QQE03-10 still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the QQE03-10 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 QQE03-10 sound like?

Push-pull beam in one envelope.. 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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QQE03-10 QQE03/10 Tetrode Vacuum Tube

Tetrode6.3V / 0.82A9-pin Noval (E9-1)SPICE

Sourcetubeampdoctor QQE03/12·QQE03/10 (double beam tetrode)Reviewed2026-05-29StatusDataModelCalcModelKoren pentodePDF

Beam power tetrode rated at 7W for high-power output stages

Datasheet ↗SPICE

QQE03/10 — Philips — tetrode vacuum tube — (1955)

3.3mA/V

6.2pF

0.1pF

2.60pF

GAIN8%

POWER18%

DRIVE50%

LINEARITY95%

SPECIFICATIONS

Heater6.3 V · 0.82 A

Max Plate Voltage300 V

Pa max7 W

Gain Factor8

gm3.3 mA/V

rp—

Inter-electrode capacitances

Cgk6.2 pF

Cgp0.1 pF

Cpk2.6 pF

Pinout9-pin Noval (E9-1)

Era1955

RarityModerate

HEATER6.3V / 0.82A

MAX PLATE300V / 7W

BASEnoval

Source datasheets

3 manufacturer datasheets cross-checked for QQE03/10

3 verified

EXECUTIVE SUMMARY

The QQE03-10 is a indirectly-heated beam tetrode from Philips, introduced around 1955. Commonly used in transmitting applications. Push-pull beam in one envelope.

HISTORY

Introduced1955ManufacturerPhilips

Golden Age

QQE03-10 Datasheet

Frank's Electron Tube Pages · PDF

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METRIX TESTER

Test this tube on a Metrix

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