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The Quad ESL - Christian Steingruber

    http://quadesl.org/index.php/hard-core/amplifiers/christian-steingruber
    Avondale Audio 405 England 1990 onwards. Mr. Les Wolstenholme, the owner of Avondale Audio, realized the potential of the standard Quad 405 and offered a similar modification as the Mac Mod which bettered the sound dramatically. In addition to Steve's modifications, Les fitted a special external power supply to feed the input OP .

AVONDALE AUDIO – Bringing Music to Life

    https://avondaleaudio.com/
    Avondale Audio is a small UK based company founded in Chesterfield, England, in the 1980s. In 2021 we moved to larger premises in Cragg Vale, West Yorkshire. We design and manufacture ultra-high performance, easy to install ‘drop-in’ upgrade modules for Naim amplifiers and power supplies, as well as for DIY builders.

Quad 405-2 and Quad 34 Pre Amp, Both Avondale modified ...

    https://hi-fi.org.uk/quad-405-2-and-quad-34-pre-amp-both-avondale-modified/
    Quad 405-2 & Quad 34 Pre Amp, modded by Avondale Audio These 2 paired together sound something else. They are not a standard 405-2 and a 34 pre amp the were worked on and modded by Les from Avondale Audio, I have heard the standard but honestly back in the 90s these were some of the best bits of modded kits around.

Audio Nirvana. Página de Audio de Ernest Ruiz

    http://www.audio-nirvana.com/pag_eng/amp4quad.htm
    Avondale Audio 405 England 1990 onwards The specialists around Mr. Les Wolstenholme realized the potential of the standard Quad 405 and offered a similar modification which bettered the sound dramatically. In addition to Steve McCormack’s modifications, Avondale Audio fitted a special power supply to feed the input OP .

Audio Nirvana. Página de Audio de Ernest Ruiz

    http://www.audio-nirvana.com/pag_eng/ugly.htm
    Quad 405 or 405-2 modified by Avondale Audio or Steve McCormack (monobloks) Spectral DMC 50 , DMC 100 Class A Stax DA 80 , MA 80 , DA 300 all Class A 2. Recommended Contemporary Offers. Atmasphere S-30, M-60, MA-1 OTL Esoteric Audio Research 861 triode, bridged as monobloks Esoteric Audio Research 534 pentode, bridged as monobloks

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