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 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.

QQE03-10 QQE03/10 Tetrode Vacuum Tube

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

TetrodeHeater 6.3 V · 0.82 A9-pin Noval (E9-1)Philips 1955

Plate dissipation: 7W
Max plate voltage: 300V
Transconductance: 3.3mA/V

QQE03-10

Characteristics

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

HeaterIndirectly heated

Specifications of QQE03-10 — Heater
Heater voltageVh	6.3 V
Heater currentIh	0.82 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of QQE03-10 — Limiting values
Plate voltageVa max	300 V
Plate dissipationPa max	7 W

Mechanical

Specifications of QQE03-10 — Mechanical
Base	9-pin Noval (E9-1)
Rarity	Moderate
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of QQE03-10 — Small signal
Transconductance	3.3 mA/V
Amplification factor	8

Capacitances

Specifications of QQE03-10 — Capacitances
Input	6.2 pF
Grid–plate	0.1 pF
Output	2.6 pF

Charactereditorial reading, not a measurement

Specifications of QQE03-10 — Character
Gain	8%
Power	18%
Drive	50%
Linearity	95%

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

Using this tube

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Sources

By Jean-Michel Falligan DevergneReviewed May 29, 2026Source : tubeampdoctor QQE03/12·QQE03/10 (double beam tetrode)Active model : Koren pentode

Manufacturer datasheets

3 manufacturer datasheets cross-checked for QQE03/103 verified

QQE03-10 DatasheetFrank's Electron Tube Pages · PDF

SPICE models

Revision and verification status

Source: tubeampdoctor QQE03/12·QQE03/10 (double beam tetrode)
Reviewed: 2026-05-29
Status: DataModelCalc
Model: Koren pentode

Context

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

Introduced: 1955
Manufacturer: Philips
Era: Golden Age

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