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.

By Jean-Michel Falligan Devergne · Reviewed May 29, 2026

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QQE03-12 QQE03/12 Tetrode Vacuum Tube

Tetrode6.3V / 0.82AB7GSPICE

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

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

Datasheet ↗SPICE

QQE03/12 — Philips — tetrode vacuum tube — (1958)

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

PinoutB7G

Era1958

RarityModerate

HEATER6.3V / 0.82A

MAX PLATE300V / 7W

BASEb7g

Source datasheets

3 manufacturer datasheets cross-checked for QQE03/12

3 verified

EXECUTIVE SUMMARY

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

HISTORY

Introduced1958ManufacturerPhilips

Golden Age

QQE03-12 Datasheet

Local mirror · PDF

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METRIX TESTER

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