"(...) 'Peter does incredible work on all vintage microphones. One of our favourites is a Neumann/Gefell UM57 totally rehabbed and outfitted with his solid-state multipattern power supply,' Holtzman says."

MixOnline on Les Paul's latest, grammy-awarded album, recorded at Eastside Sound NYC

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"The DN221 is beautifully made(..). The Tubelife-257 and the Gefell supplies sounded fabulous, with strong mids and deep lows, but the DN221 was quite different. (...) Transients seemed quicker and fine details were enhanced. "

MusicTech Magazine, Dec.2006

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Scroll down for a choice of people and facilities who trust in our work...

Jorge Avendano, Mexico City - Angelic Record Productions, UK - Audio Unity Tokyo/Japan - Baba music, France - Bandman Music and Recording, Springfield VA - Boom Room Studios, Austria - Anouar Brahem, Tunis - Henrik Cederblom, Sweden - Bunnyco, Belgium - Canorus Inc., Nashville TN - Capitol Records, Hollywood CA - Edwyn Collins, London/UK - Coral Sound Inc., Long Island NY - Courtlen Recording, Hanson MA - Deepfield Studio, Nashville TN - Digital Bob Recording, Dany Rohde, Berlin/Germany - Donagh Long, Ireland - Doug McKean, Los Angeles - Vlado Dzihan, Vienna/Austria - Eastside Sound, NY - La Fémis Film Academy Paris/France - Goran Finnberg, The Mastering Room, Sweden - Flagler Pro Audio, FL - Fox Music Company, Germany - Antoniano dei Frati Minori Bologna/Italy - Paul Giger, ECM Switzerland - Koen Gisen, Belgium - Gismo Studios, Motril/Spain - Gratte-Ciel Studios, Paris/France - Finur Hakonarson, Reykjavik/Iceland - Hawaii Institute of Marine Biology - Helicopter, Gent/Belgium - Helter Skelter, Stockholm/Sweden - Hickorystreetstudio, NY - Jolly Roger Recording, NJ - Justin King, Eugene OR - The Kodak Theatre, Hollywood CA - Nino Laurenne Sonic Pump Studios Helsinki/Finland - Luckymusic, Switzerland - Madooma Vintage Mics Germany - Magnanimous Recording Studio, Thessaloniki/Greece - Mammoth Sound Solutions, Burbank CA - Mario J.Martin, Studio City CA - McDonnell Productions, Netherlands - Doug McKean, Santa Monica CA - Guido Martens, Belgium - Bart Mombaerts, Belgium - Nelldal Productions, Stockholm/Sweden - NoHype Studio, Belgium - Gunnar Norden, EMI Sweden - Officine Meccaniche Rec. Studios, Milan/Italy - Opera Prima Napoli/Italy - Organic Music, Germany - Paraktio Studio, Athens/Grecce - Peermusic, Hamburg/Germany - Benoit Piccand , Bern/Switzerland - Playground 571 Zurich/Switzerland - Porgy & Bess, Vienna/Austria - Power Sound Studio, Amsterdam/Netherlands - Prolyd, Norway - Regime Studios, Los Angeles - Qubitt AB, Sweden - realsound.it  Udine/Italy - Matthias Reim, Ibiza/Spain - Rising Sun Studio, Belgium - Riverbend Studio, Chicago IL - Rock Town Rotterdam/Netherlands - Rohrklang, Germany - Oddvar Ruud, Norway - Silent Sound Studio, Montreal - Silver AB Martin Hedström, Sweden - Silverstone Studios, Saratoga Springs NY - Soundpark Studios, Munich - Soundspur Records, Austria - Soundtrack Studio, Sweden - State University of New York - Studio de l'Arrosoir, Paris/France - Sonic Pump Studios Nino Laurenne, Helsinki/Finland - Studio des Aviateurs, France - Studio des Forces Motrices, Geneva/Switzerland - Studio Intonato, Ted White, Manhattan Beach CA - Studio Lakanal, Montpellier/France - Sutton Sound Studios, Atascadero CA - TELEFUNKEN USA - The Audioplex, Singapore - Theater und Philharmonie Essen, Germany - Ton-Licht-Eventkoordination Martin Vetters, Vienna/Austria - Tonstudio Solle Everswinkel - Tucton Audio Service, Switzerland - Tuerk Technologies, Johannesburg/South Africa - Caglar Türkmen, Istanbul/Turkey - Tundra Records, Denmark - University of Texas Dept. of Music, San Antonio TX - Paolo Vinaccia, ECM Norway - Wavebase Scottsdale AZ - Martin Westlund, Gothenburg/Sweden - Wildplum Studio, Oakland CA - Wonderlust Productions, UK - Yleisradio Finland - Zack Studio, Switzerland - Zurich School of Music, Drama and Dance, Switzerland - (t.b.c.)

Some of our clients' appreciated feedbacks:

We will name the mic after you. The 57 is really getting a lot of repeat requests and is satisfying many clients. Great on Chico Freeman's sax on his latest CD. I always let everyone know who who brought it to life.
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The mic sounds excellent and is in the condition you described. Great power supply!
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I would like to report that the U67 is working (sounding actually) perfectly after the service you did. Thanks.
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How happy I am with the work you've done on these two mics. They sound fantastic. Thank you !
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What a detailed mic. Blew away our akg's.
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The mic sounds incredibly smooth, especially on the top end. I really love it.
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The power supplies are some of the most beautifully made and beautifully finished pieces of electronic gear that I have ever seen.
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I never heard anything like in my life
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...never I would imagine that a CMV563 could sound this way. (...) It is now one of the best sounding mics I have ever heard. And I heard a lot of the best sounding "classics" and also new stuff. Biggest compliments.Your work is great and I am really happy with the sound...
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Ein wunderschön klingendes Instrument... grossartige Arbeit - und nochmals herzlichen Dank!
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Ich bin nach wie vor entzückt über diese hervorragende und wunderbar verarbeitete Lösung.
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Die reskinnte Kapsel klingt hervorragend. Ich kann keinen Unterschied zum Original feststellen. Tolle Arbeit! Vielen herzlichen Dank!
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Vielen Dank für Ihre tolle Arbeit! Wir sind sehr begeistert von unserem matched U87 pair!
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I received your PSU DN 221 and i used it immediately during a recording in the afternoon. The microphone doesn't lose the warm and typical bass... I am very happy to work with you!
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Ich bedanke mich sehr herzlich für ihren absolut grossartigen (und von mir in der form bisher noch nie erlebten) service!
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Your Power Supply looks brilliant,
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Thanx for the excellent business on the power supply.
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The mic (and power supply) is awesome. Thanks once again.
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Thanks doctor !
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My 87 is now close to perfection!
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My U87 sounds lovely by the way. Thanks again!!!
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I luv your work...
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Many thanks for an excellent product & your very efficient service.
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It's wonderful to have one of my favorite mics finally without "tube frying" noises. I really appreciate all of your good work!
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I always use those mics on EVERY session. They have a certain something...
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Danke für den guten Service. Das U87 funktioniert wieder bestens!
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Your support has gone above and beyond any I have experienced anywhere, from any manufacturer or retailer.
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I am so appreciative of your work and help, it is the best on earth! Old world craftsmanship and new world friendliness, what an unbeatable combination.