Audio Doctor
Audio Doctor


Please enter the code
* Required fields
Please be aware that the contents of this form are not encrypted
  • stewart waintroob (Thursday, August 25 16 03:45 am EDT)

    Dynaco ST-70
    Cornell rebuilt onr of my my ST-70's with very sophisticated upgrade boards. When he was done it performed as well as Mcintosh power amp. It is absolutely beautiful.


  • Stewart Waintroob (Thursday, August 25 16 03:37 am EDT)

    Work on Macintosh MX-110 and MC275
    Cornell did fantastic work on my Macintosh MX-110 and MC275. The MC275 and MX-110 both MORE than met their original specs after he worked on them. He virtually rebuilt the MX-110, and found a really
    clever solution to fix the tuner on the MX-110.

    I have a masters in electrical engineering and can honestly say he is the best technical engineer I have ever seen. I feel fortunate for the last 7 or 8 years he has worked on my audio gear. Thanks

  • Rich (Friday, August 12 16 04:00 am EDT)

    Thank You Cornell!
    I Had the pleasure of meeting Cornell in person. My Pioneer SX 1050 was in the of repair, and the vintage nature of such a fine receiver requires the care that only a true professional like Cornell
    can provide. His work was completed in a timely manner, and I have enjoyed having my legendary pioneer receiver back in action. Thank you Cornell!



  • Steve Johnson (Sunday, July 10 16 06:09 am EDT)

    Great repair job...again!
    Six years ago, Cornell repaired my 60 pound Heathkit power amp (AA-1640) from the '70s. Now, once again, it needed help and Cornell fixed it. This thing is almost 50 years old and still sounds great;
    thanks to my original assembly skills and Cornell's troubleshooting and repair skills. He's the go-to guy for this stuff!

  • Bernard Dobrin (Friday, June 24 16 06:52 am EDT)

    Martin Logan Sequel II speaker
    Martin Logan doesn't have any factory service locations other than the factory and it would have cost a couple of hundred bucks just to send the non-working speaker back for evaluation and repair.
    Luckily I was able to follow up on a couple of leads and found Cornell. He diagnosed and repaired issues that I had never heard of before. Great job and cost less than just the factory shipping.

  • Murry Williams (Wednesday, June 08 16 05:09 am EDT)

    MC2200 Repair
    What a treasure! We moved to northern Arizona from Austin Texas about four years ago with an assortment of 1970's / 1980's quality stereo equipment. When my amp began to have problems, I began to
    search for a repair facility in the valley. I had several conversations with companies saying "just bring it in", to me only red flags.

    A well qualified McIntosh technician in Austin, began to make contacts for me. His friend in Houston told him all about Cornell, along with a story of his experience and long reputation in the
    industry. He was right on every account! If you have any vintage quality stereo equipment look no further...Cornell is your answer.

    Thank you Cornell. You will be seeing more of me in the months and years ahead.

  • j lawrence dunlavey (Wednesday, May 25 16 12:01 am EDT)

    Repair of Sony TA- 80es - multiple units
    Cornell is the greatest, solid reliable repairs, highly knowledgeable, fun to talk to, always ready, willing, and able to help with repairs or knowledge. Prices are very reasonable - never forget;
    you get what you pay for. And in the case of high quality 1990's high performance units, not easy to find!!!! Always. Good luck Cornell!!!

  • Rich Concia (Friday, May 13 16 07:00 pm EDT)

    McIntosh repair
    Mr. Smith is a pleasure to work with. My Mac was flawless and works perfectly now. He also took the time to explain how to improve the performance of my overall set-up. I couldn't be happier.

  • James Moyer (Friday, April 29 16 08:31 pm EDT)

    Sansui 9090
    Quality. Sansui 9090 singing....and shining w/ fantastic new matching LED's that match the classic look. Class.

  • Keith W (Wednesday, April 27 16 02:05 am EDT)

    Marantz Repair
    Can't stop smiling! Haven't heard my 2285B in 20 years! WOW! Amazing job!

  • John (Tuesday, April 19 16 04:53 am EDT)

    Recap of integrated amp
    Mr Cornell Smith is an asset to anyone wanting to keep vintage gear operating at a high level. Cornell completed a recap of a 40 year old Marantz integrated amp and it sounds fantastic. Cornell
    completed the job quickly and I could not be happier. Thank you!!

  • Vince R. Felix (Wednesday, March 16 16 02:01 am EDT)

    Turntable clips replace and installing 2M Bronz MM Cartridge
    " WOW " is all I can say about Cornell Smith repair work on my turntable. The repair work was on phono clips and installing a 2M Ortofon Bronz MM cart and let me tell I heard things off my record I
    didn't know existed. Soundstage is alive, the texturing of the sound never heard before...simply amazing!. Mr. Smith will be my new audio vintage repair guy from this day forward. So...if you're
    looking for some who has the golden finders for repairing your gear, " Audio Doctor " is the way to go. Thank you Cornell!

  • Brad H (Thursday, March 10 16 11:59 pm EST)

    Quality job
    Cornell did a great job replacing my amp board on my sub woofer. Good to know there's a skilled technician available for repairs.

  • Jerry's Audio/Video (Thursday, March 10 16 05:42 am EST)

    One of the BEST technicians on the planet
    We have used Audio Doctor for many years for both factory and out of warranty service. Cornell is one of the most experienced technicians in the valley, if not the planet. My father has had a
    relationship with Cornell since the mid 60's and you will not find a more honest person to work on your high end electronics!!!!


    Michael Kowitz
    Jerry's Audio/Video
    The Home Technology Specialists, since 1970

  • V R. (Monday, February 08 16 05:01 am EST)

    Definitive Technology speaker
    I had checked around the area and couldn't find an authorized service and repair shop for the speaker. Cornell repaired this speaker and it works great! The repair was completed very quickly and the
    price to repair was competitive. I will use the Audio Doctor for any other repairs. Thank you, Cornell!!

  • Todd Limbert (Tuesday, February 02 16 10:57 pm EST)

    Rotel RX 802
    Once again the Good doctor has revived one of my old and loved receivers! Always professional and prompt are the reasons I ship from PA to the Doc's desert playground! Thanks again Doc!

  • Fred Davidson (Tuesday, January 12 16 06:13 am EST)

    Vintage Detrola radio/phono

    I own a vintage Detrola Model 327 radio/phono. According to the schematic from, it dates "pre-1941". This is a table-top unit with standard broadcast (i.e. AM) and shortwave. It has
    a 78 RPM direct-drive phono. In the mid-1960s, when I was young boy, our neighbor passed away. Her daughter was a friend of my parents and gave this radio to us. I set it up on the third floor of my
    boyhood home, where I listened to 78 RPM records such as the "Grand Canyon Suite", and where I tuned in shortwave after the sun went down. I even caught the English-language Radio Moscow service from
    time to time, and I learned a bit about something called "Communism" ( :) ). Well, as Dylan Thomas said, "time passed". We moved, and after many years and after the passing of both of my parents, the
    Detrola came back to me. It was in bad shape, having spent a long time in a basement where, among other deterioration, some mice had made a home inside of the unit. I sent it to Tom's Antique Radio
    Repair in Dayton, Ohio. Tom did a magnificent job on the cabinet and got the radio working perfectly, but he was unable to restore the phono. You can see the finished result here:
    %3C Some years later, after moving to Phoenix, I decided to try again to revive the phono. I took the unit to Cornell
    -- the Audio Doctor. He tore apart and tore into the phono with gusto, and he revived it. The unit now plays 78 RPM records again. Boyhood memories come full circle. Thanks, Cornell -- a job well

  • Reza Malek (Thursday, December 17 15 09:47 pm EST)

    B+O receiver
    Recently, my old B%26O receiver (Beomaster 8000), which was in mint cosmetic condition, malfunctioned. A few enquiries from Scottsdale/Phoenix electronic outfits revealed that Mr. Cornell Smith was
    the best expert for the job. Indeed, I found him to be not only a perfect gentleman but also, equally importantly, the first class technical expert I needed. He masterfully updated/replaced all the
    deteriorating electronic components of my B%26O receiver. Indeed, he cured all of its problems, restored its various functions to perfection, and did so with such care that it remained in
    cosmetically the same perfect condition in which it had been delivered to him. I have nothing but highest regards for Mr. Smith personally, and praise for his care, knowledge, and expertise in his
    chosen field.

    Reza S. Malek, MD, FRCS(C), FACS
    Professor Emeritus of Urology
    Mayo Clinic

  • stewart waintroob (Friday, December 11 15 11:44 pm EST)

    I have worked with Cornell for a number of years. It is important to note that I have a BS %26 MS in Electrical Engr. and taught Electronics at Chandler/Gilbert for 5 or so years. Cornell is a truly
    gifted with respect to working with Audio Equipment. He has fixed numerous pieces for me, both tube and solid state. Me knows more tricks to save equipment than I could ever know. He repaired a
    Yamaha Receiver for me and fixed the Phono section although the circuit board was cracked and broken in it. It sounded perfect. He restored an entire Dynaco tube system for me. I have an unfair
    advantage in judging his work because I understand exactly what he is doing when he improves an Amp such as putting Cathode resistors in a couple of Fisher tube receivers. Yes, he's kept up Mcintosh
    gear. Who else would I trust? Now, Cornell isn't the cheapest guy possible, but he is fair, reliable, and he should be able to make a decent living. I am kind of a Altec historian....He is an
    EVERYTHING historian. He is also a nice guy. I am happy to consider him a friend.

  • Don Ross (Wednesday, December 02 15 03:45 am EST)

    Marantz 2325 Receiver
    I wanted this unit to be tested and repaired by a professional, so I searched locally and found Cornell Smith, Audio Doctor.
    He painstakingly worked his magic and I am pleased with the results. I then brought to him a Carver Sunfire amp to be tested and it was found to be performing flawlessly. I will continue to engage in
    business with Mr. Cornell Smith, as I trust his expertise.

  • shawn (Wednesday, November 18 15 05:25 am EST)

    Mcintosh MX 113 and MQ 101
    I had Cornell work on my MX 113 and MQ 101
    what an awsome and fast job, plus very reasonable on price. Now i'm digging out other vintage equpt I have to be brought back to factory spec.
    Anybody with Vintage or newer Mcintosh gear needs to see the Doctor.

  • Dan Hess (Wednesday, November 11 15 07:05 pm EST)

    McIntosh Audio repair
    A few years ago my C32 was on the fritz. Called Mc at Binghamton and they recommended you as a highly qualified Mc specialist in the Phoenix area. Since then you have worked on my MC 2200, MC2205 and
    MA6200. All are working like new now.
    It is nice not to have to ship back east and have a local specialist to keep all my old McIntosh stuff in good working order. It would be nice if you would move a little closer to Wickenburg.

    Thanks Cornell. Dan

  • Rick (Monday, November 02 15 04:39 am EST)

    Mcintosh and Nakamichi repairs
    Thanks Cornell both my amp and tape deck look and work like new! What a fast turn around from when I brought them in to completed repairs!! A+ service!!

  • Todd N (Friday, October 30 15 02:30 am EDT)

    Turntable Repair
    Cornell did a great job getting my old turntable resurrected from decades of sitting idle. He turned it around quicker than I expected and even told me when to keep an eye out for my styluses
    lifespan. I highly recommend him for your stereo repair needs.

  • Donald Perry (Thursday, October 29 15 06:39 am EDT)

    macintosh 6100
    My mac was a 50 lb paperweight now sounds better then when I bought it. I was very impressed with his knowledge and skill. I plan to use him in the future for my turntable

  • Yaron Yarden (Saturday, October 17 15 04:42 am EDT)

    McIntosh MCD7008
    Cornell worked his magic again! My MC7008 stopped reading cd's. Cornell brought it up to spec and replaced the glass (I had one ordered from McIntosh). It looks, works and sounds like a brand new
    unit. Thank you Cornell! You're the best!

  • Clay Rouse (Tuesday, October 13 15 01:52 am EDT)

    Mac 4100 repair
    I just received my McIntosh 4100 receiver back from Cornell and I couldn't be happier with Cornells' work. The receiver now sounds wonderful. Thanks for the great work Cornell!

  • Kevin Fair (Wednesday, October 07 15 12:18 am EDT)

    NAD 7240 Receiver Repair
    I was about to donate my old NAD 7240 receiver to Goodwill, when I thought about giving Cornell a shot at fixing what might be wrong. Cornell to my amazement had my receiver up and sounding great
    again within a couple days! I am a very satisfied customer once again!

  • Mike (Saturday, October 03 15 06:35 am EDT)

    Speaker Repair
    Would you be able to assist with the repair of my Vandersteen 2 Ce speaker? Need assistance soldering on the repaired woofer.

  • Robert Cooper (Monday, September 28 15 08:44 pm EDT)

    General Repairs
    Cornell was responsive, knowledgeable, and very professional. His work is through and competitively priced. I will continue to utilize his services and highly recommend to anyone.

  • Randy Moudry (Wednesday, September 16 15 05:06 am EDT)

    Once again, I received a piece of equipment from Cornell, in this case a Pioneer RT 909 RtoR, back in superb condition, everything work per spec or better, with a long life ahead. It is really great
    to have someone of his caliber available to renew and repair my Mac, Marantz and other quality equipment.

    Thanks Cornell!

  • Bart Graffin (Wednesday, August 26 15 05:35 am EDT)

    c-32 preamp
    Read all about Cornell and after our first meeting I liked him right away...a class act and response time I believe no one else can match....Thank you Cornell !..My preamp now sounds wonderful!....I
    highly recommend anyone having issues with others give this man your next will not be disappointed..words just don`t say enough...To the next time!

  • Eric (Wednesday, August 26 15 03:01 am EDT)

    Maintenance, repairs, upgrades at an uncompromising value!
    Cornell, is by far the most competent and knowledgeable certified McIntosh service technician in the valley, if not, the whole US! The value I have received in his services and experiences goes well
    beyond expectation.

    Full maintenance tune-up on my Technics table; Fix and upgraded rebuild of my Event ASP8's; Full maintenance and repair on my Yamaha amp. Recaps,cold-solders,IC replacements, calibrations and

    If you're looking to repair, modify or upgrade your system components, you can count on his professionalism to meet your needs! Cornell wants you to be happy with his services and offers immeasurable
    knowledge in helping you decide what options are available within your budget. Thank you very much Cornell! It has been a pleasure getting to know you and look forward to our next meeting!

  • James May (Saturday, August 22 15 11:22 pm EDT)

    Schematic for a McIntosh CR7 Remote Volume nad switching unit with Power on/off
    I purchased a very nice CR7 remote unit from Audio Classics about 18 years ago and it has worked flawlessly. Since having to retire early with disabilities as a Network Specialist, my funds are short
    this year thanks to paying for Part D Medicare Prescription supplemental which works out to $789.00 less this year. I noticed the unit had acquired a small dent in the lower left front panel after
    being with family for a weekend reunion. My friend that I live with has Adv. MS and he accidentally knocked the stand over the CR7 sits on. So I opened it up and carefully removed a couple circuit
    boards in order to completely clean the unit and check for possible signs of wear etc. While in the process, a grey wire that was soldered to the upper circuit board had fallen off. So I checked the
    area where I noticed this wire was attached and could only find one solder joint with lots of bright light and a bifocal magnifying glass where some stranded wire had been attached. So I stripped a
    small end of the wire and tinned it to be placed back where I figured it belonged. I reassembled the unit and everything switch wise worked through the remote control, but the volume sounded muffled.
    When the unit was apart I also noticed a pink colored wired attached to a number one pin of a Toshiba IC which had a 3.3K ohm resistor soldered 4 pins down the same side of the IC. Something that has
    worked very well for years when cleaning and servicing electronics, is a small mixture of Cramolin ol to 91% or better rubbing alcohol to clean contact switched and IC sockets to prevent future
    issues with corrosion and providing a noise free cleaning that lasts a long time. If some has a photo of the inside components of a CR7 or a picture of the factory schematic that usually comes with
    the user guide and warranty card when purchased new. Well I have everything but the service sheet. Any assistance would be greatly appreciated from one McIntosh owner to another.

    Thank you for reading my request as I hope to share some of the very many models of McIntosh equipment I have owned and or repaired starting back in 1973 as a CET at Oregon Typewriter and Hi Fi. I
    always looked forward to the McIntosh Clinics and watching Gordon Gow do his testing and replacing tubes at No Charge to bring a vintage amplifier back to factory specs or better. I really miss the
    chats with Gordon as was a very brilliant engineer that created some of the best models of tuners etc. for all the years he worked at McIntosh Labs in Binghamton NY.
    James May
    Eugene, Oregon

  • Craig O'Brien (Thursday, July 23 15 10:48 pm EDT)

    Restoration of Old Components
    Cornell Smith did excellent, exceptional work on my two a/d/s PA-4 amplifiers. The amplifiers are old, from the ‘80’s, but were well made. I like using older components so that I save a little money,
    but get to enjoy great performance. Mr. Smith made the magic happen. He rebuilt the two amps with the right high quality components. (One aspect of the rebuild was replacing the original
    inputs/outputs with Rahn and Cardas fixtures – well worth the money) The amps now fit perfectly in my rig: Sony ES CD player used as a transport, TOSLINKed to a Parasound DAC, then into a Quicksilver
    Audio linestage preamp, through the PA-4’s, into KEF LS50 speakers. The full, bridged power from the restored amps permits a tremendous depth of field and soundstage from the speakers. The process of
    working on these amps was not simple because one of the amps was hammered by FEDEX and had to go back for a second reconstruction. Cornell did not bat an eye, simply repairing the damage and moving
    forward. I was trying to think of how to say how much I trust Cornell Smith to do the right work, and skillfully. I have to fall back on saying that I will send all of my components to Mesa, it’s
    that simple for me. I love the music most of all and anything I play now sounds great!

  • Craig O'Brien (Thursday, July 23 15 10:47 pm EDT)

    Restoration of Old Components
    Cornell Smith did excellent, exceptional work on my two a/d/s PA-4 amplifiers. The amplifiers are old, from the ‘80’s, but were well made. I like using older components so that I save a little money,
    but get to enjoy great performance. Mr. Smith made the magic happen. He rebuilt the two amps with the right high quality components. (One aspect of the rebuild was replacing the original
    inputs/outputs with Rahn %26 Cardas fixtures – well worth the money) The amps now fit perfectly in my rig: Sony ES CD player used as a transport, TOSLINKed to a Parasound DAC, then into a Quicksilver
    Audio linestage preamp, through the PA-4’s, into KEF LS50 speakers. The full, bridged power from the restored amps permits a tremendous depth of field and soundstage from the speakers. The process of
    working on these amps was not simple because one of the amps was hammered by FEDEX and had to go back for a second reconstruction. Cornell did not bat an eye, simply repairing the damage and moving
    forward. I was trying to think of how to say how much I trust Cornell Smith to do the right work, and skillfully. I have to fall back on saying that I will send all of my components to Mesa, it’s
    that simple for me. I love the music most of all and anything I play now sounds great!

  • Bill Shepherd (Thursday, July 23 15 02:21 am EDT)

    Linn Axis motor board problem
    Hello Cornell, I've been using a Linn Axis turntable to play vinyl on, but the motor no longer maintains precise speed. I'm wondering if the cca is servicable, or if I should replace the entire
    motor/board, assuming their even available?
    Thanks for any advice that you may have.
    Bill Shepherd

  • G.W. Northan (Friday, July 17 15 02:18 am EDT)

    MX112 repair
    Cornell was rapid, fair, professional and helpful. I am very satisfied and can recommend him.

  • John L Frigo (Monday, July 13 15 04:02 am EDT)

    McIntosh MC 2105 amplifier
    I took the Mac amplifier to LMC in Tempe, AZ for service. It had been fifteen years since I last used it because the speaker switch was defective. Cornell called me with the diagnosis and we had a
    great conversation. He quoted me a fair price and he repaired the amp quickly. He also gave me the option of replacing the panel lamps with LEDs. Wow! That amp looks and sounds brand new! I will have
    him as my audio doctor from now on.

  • Mike Bernays (Wednesday, July 01 15 03:50 am EDT)

    repair of dvd player
    I have a Sony DVD player that I have been using for several years as my cd player. It began to not be able to read the discs, so I took it to Cornell. He quoted me a reasonable bench fee to examine
    it and discovered it needed a new optical pickup which is no longer available. He only charged half the quoted fee. Very satisfied with his service despite the unsuccessful nature of his efforts.

  • Alex (Monday, June 29 15 07:32 pm EDT)

    Pioneer turntable repair
    I brought an old Pioneer PL-50A turntable to Cornell to service. It belonged to my dad but he had it sitting in his garage in the Bay Area for over 20 years. I convinced dad to let me provide it a
    new home. The last time I saw it, it worked. But I figured that laying dormant in a dusty garage was not a good thing.

    Not only did Cornell service the system, but he did a stellar job of cleaning the exterior. The wood panels looked fairly new and the smoked lid looked brand new.

    When I brought the turntable home, the platter was rotating slowly. I called Cornell and he told me to bring it back. It was a little piece (don't remember the name) that was stressed, likely from me
    driving back. He replaced the piece and suggested I remove the heavy platter as its vibration while driving may have damaged that piece.

    When I returned home, the turntable ran perfectly.

    Cornell has more than earned my future business.

  • Jim Feeney (Saturday, May 23 15 11:40 pm EDT)

    Was having trouble with my MAC1900 FM band. I had taken it to another shop that had not repaired it. After doing my online homework, I found Cornell. I do not want to sound like a broken record, but
    Cornell is as other postings have said. He gave me a repair estimate within 2 days, and my Mac was ready for pickup about a week later. Cornell was thorough, honest and fair. And my 1900 is working
    as it should. I live in the Phoenix area and dropped it off and picked it up myself. I can assure anyone that Cornell is a professional running a professional shop.

  • Stuart (Monday, May 04 15 07:22 pm EDT)

    Amazing repair
    Cornell impressively repaired my B%26O turntable. Even though the turntable is old, he was able to quickly identify the problems with the turntable. Throughout the process, he timely communicated
    with me so that I was informed of his progress. All told, his repair and communication skills made this a a great experience.

  • Kyle (Friday, April 24 15 11:02 pm EDT)

    Yamaha CR 3020
    Greetings: My name is Kyle and I recently came into procession of a rarity the rather large and beautiful Yamaha CR 3020. My local tech has gone over it but I believe it needs to be refurbished and
    bought up to the original specs. Can this be done @ your shop? Thanks in advance.

  • Lute Thompson (Friday, March 27 15 06:40 am EDT)

    McIntosh Equipment
    Cornell has been most helpful to me and my enjoyment of my audio equipment. He had to do some real detective work; uncovering an intermittent ground problem with a preamplifier. Thanks, Cornell

  • David Powwell (Thursday, March 26 15 02:01 am EDT)

    McIntosh Repairs
    Cornell is easy and knowledgable guy to work with. I have been having problems with my vintage McIntosh(1960's-1970's)gear. Local guys in town tried but couldn't figure the issue out. Then I found
    Cornell, and he was able to fix it. Cornell is worth the trip.

  • Mickey Clements (Tuesday, March 17 15 09:55 pm EDT)

    Great Service- Easy to work with
    Cornell did a fantastic job getting my broken old Technics receiver up and running like new. He was very easy to work with, and extremely responsive to my emails/phone calls.

  • David Franks (Friday, March 06 15 09:53 pm EST)

    Yamaha CR2020
    I too own a Yamaha CR2020 which I purchased brand new in 1979--I still have the original packaging and manual; and it still looks beautiful. I had a problem with the left channel cutting out
    intermittently and a couple of the meter lights were burned out. I brought the unit to Cornell, he did his magic, and I think I’m good for another 36 years. I’ll be bringing him my NAD 7400 next.

  • Rick Aylward (Sunday, March 01 15 09:51 pm EST)

    Restoration on my vintage reciever
    I have a Yamaha CR 2020 receiver that I bought back in my high school days ( mid 1970's) from Audio Consultants in Evanston IL. It had been sitting in a closet unused for the past 15 years or so. I
    decided to start using it again but wanted to have it checked out and repaired / restored as needed before I hit the ON button. Cornell was recommended to me by several people as the top Yamaha
    expert in the Southwest. He did an excellent job making it look and operate like a brand new unit. He was great to work with. The results were even better than I had hoped, and the cost was very
    reasonable considering the quality of his work. All told he gets my highest possible recommendation! Thank you Cornell!!!

  • Randy Moudry (Tuesday, February 17 15 03:46 am EST)

    Cornell has worked on two of my receivers and done an excellent prompt job at a reasonable price. Tremendous attention to detail. He is a pleasure to work with.

Contact Us Today!

Audio Doctor

Cornell Smith
4061 E Woodland Dr
Phoenix, Arizona 85048

Phone: 480-759-3724

Mobile: 602-741-0730


Print Print | Sitemap
McIntosh Parasound