EWA Q-20 Power Amplifier

EWA Q-20 Power Amplifier

Q Bundle
Power lead

Q-20 Power Amplifier


Q-amps are aptly named, they achieve far more than they ought to! The Q-20 power amplifier will astound with it's power and control, all from such a small size. What really stands out is the outstanding timbre and transparency. EWA Q-amps work great with vintage Tannoys, we are told, and the Wharfedale heritage range. Class A/B with genuine SECA driver stage.


Captive mains lead. EWA MCS-2.5 reference power cable available to order.



  • Q-20 Power:


    1V = full power into 8Ω.Power output:​

    • 30W/8

    • 55W/4

    Bandwidth: 200KHz​ ±1dB

    Damping Factor: Over100 (dynamic).

    Zero crossover distortion + sliding bias system.


    Standby: Under 1W.


    The output stage is run in A/B and has a SECA drive stage. Two complementary pairs of transistors rated at 25A 125W, driven by 15W 140MHz transistors. The SECA driver is running at 500mW. Extremely fast RF transistors are used to increase stability in the amp under non- normal loads i.e. no resistive a speaker with a wicked load line character.


    Power supplies can be made for most countries of the world except those on DC.Power consumption is about 30W - 150W under normal conditions and loads.


    Captive mains lead.


    Build time: Approximately two weeks.

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Home of the EWA cable system and SECA technology for amplifiers, by Colin Wonfor.  Contact us: info@ABCaudio.biz.  All text and images copyright 2021. ABCaudio, United Kingdom.