What is the QQE03-12 vacuum tube?

The QQE03-12 (QQE03/12) is a tetrode vacuum tube designed for transmitting applications. Higher-power variant..

What is a QQE03-12 substitute or equivalent?

Direct equivalents to the QQE03-12 include QQE03/10. 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 QQE03-12?

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 QQE03-12 still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the QQE03-12 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 QQE03-12 sound like?

Higher-power variant.. 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.

QQE03-12 QQE03/12 Tetrode Vacuum Tube

Also known as QQE03 · 10

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

TetrodeHeater 6.3 V · 0.82 AB7GPhilips 1958

Plate dissipation: 7W
Max plate voltage: 300V
Max screen voltage: 200V
Transconductance: 3.3mA/V

QQE03-12

Characteristics

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

HeaterIndirectly heated

Specifications of QQE03-12 — Heater
Heater voltageVh	6.3 V
Heater currentIh	0.82 A

Limiting valuesDatasheet maximum ratings — not to be exceeded

Specifications of QQE03-12 — Limiting values
Plate voltageVa max	300 V
Screen voltageVg2 max	200 V
Plate dissipationPa max	7 W

Mechanical

Specifications of QQE03-12 — Mechanical
Base	B7G
Rarity	Moderate
Pinout

Small signalDatasheet parameters at the reference operating point — not limits

Specifications of QQE03-12 — Small signal
Transconductance	3.3 mA/V
Amplification factor	8

Capacitances

Specifications of QQE03-12 — Capacitances
Input	6.2 pF
Grid–plate	0.1 pF
Output	2.6 pF

Charactereditorial reading, not a measurement

Specifications of QQE03-12 — 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

Replace or compare

Sources

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

Manufacturer datasheets

3 manufacturer datasheets cross-checked for QQE03/123 verified

QQE03-12 DatasheetLocal mirror · PDF

SPICE models

Revision and verification status

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

Context

The QQE03-12 is a indirectly-heated beam tetrode from Philips, introduced around 1958. Commonly used in transmitting applications. Higher-power variant.

History

Introduced: 1958
Manufacturer: Philips
Era: Golden Age

METRIX TESTER