ABCaudio shop: EWA M-50-P Pre amplifier front 1

EWA M-50-P Pre Amplifier


M50P pre amplifier: 


State of the art performance with an incredibly low amount of noise and zero phase shift. Class A pre-amplifier with twin buffered outputs, featuring two class A headhone outputs (6.35mm socket).

  • M-50-P pre-amplifier:

    MC and MM plus 4 line input and a dual SECA headphone out.

    Featuring an oversized power supply with four shunt regulators to squash noise, and a post regulator to drive only the relays. Four large series regulators drive the SECA headphone amplifiers and two pre regulated shunt supplies. The main bulk capacitors are four 10,000uF to reduce ripple.


    On standby all the capacitors are still charged to about one third their normal working voltage, this reduces the inrush current and significantly increases the life time use (by up to 30%).



    The design concept is broadly similar to the Q20P but with much tighter component tolerances and an over the top PSU design.

    MC: 100uV 100R InF for max output.

    MM: 1.0mV 47K Ohms at 47pF

    Line (X4): 500mV 10K Ohms

    Twin buffered outputs

    Headphone (SECA X2):

     15V 10 KOhms


    Line: 1Hz to 200KHz ± 0db

    Phono: 20Hz – 20KHz to RIAA ± 0.1db


    Power supplies can be made for most countries of the world except those on DC.


    Power consumption is about 20W - 40W under normal conditions and loads. On standby less than 1W. IEC power inlet fitted as standard.


    Build time: Approximately two - four weeks.

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Home of the EWA cable system and SECA technology for amplifiers, by Colin Wonfor.  Contact us:  All text and images copyright 2020. ABCaudio.