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Vintage audio integrations and upgrades

Custom modifications

Reaching the best sound quality possible

  • Carver M-500(t) mkII Restore and Upgrade

       (4 reviews)

    This service is a full restoration and upgrade which includes cleaning inside and out, replacement of all consumable parts, reflow of questionable solder, service bulletins, new LEDs (your choice of color) for the meters, new 5-way binding posts, high-quality output relay, and the mkII upgraded components. This mod gives your 500(t) a much higher power rating, more headroom, less commutation distortion, better current sourcing and performance into low impedance loads, and tighter bass and transient control.

    We are the only techs authorized to perform this mod. Any other 'pros' out there claiming they can do this upgrade have copied information available on our websites and perform these upgrades without our permission.

    Our prices are well worth every penny. We stand behind our work 100%. If we can impress Bob Carver himself with our work, you can't be disappointed!




    How they look when we get them:



    How they look when we're done:





    - Long life high temp capacitors throughout

    - High performance audio grade capacitors in signal paths

    - Replace all power rectifiers and power switching diodes

    - Replace voltage trim pots

    - Replace entire pre-drive stage transistors to higher voltage, higher power type

    - Replace input opamp buffer to audio grade device

    - Replace output protection relay

    - Completely upgrade and rebuild output stage transistors for more linearity, durability and higher power handling

    - Replace meter bulbs with LEDs of your color choice

    - Upgrade speaker binding posts to modern 5-way gold or silver

    - Perform factory service bulletins where needed

    - Calibrate, burn-in and test to mkII specs. I also listen to all the amps I work on. It doesn't leave my bench unless is sounds like it should.

    - m500 models are upgraded with the 't' mod, as recommended by the factory.

    Comes with a 3-year warranty and lifetime waver of bench fees.



    Power into 8 ohms:
    Stock: 251 watts  
    MKII: 395 watts 

    Clipping into 8 ohms:
    Stock: 270 watts
    MKII: 410 watts

    Dynamic into 8 ohms:
    Stock: 380
    MKII: 520 watts


    LED options:

    Warm White:







    Cool White:





    All new power output transistors for high linearity and power handling:



    Binding Posts (gold shown) and optional IEC socket




    Although the Dim Switch will still dim the LEDs, The LED driver can be trimmed to your brightness preferences (Driver model 002 shown):





    mkII upgrade and restore Cost: $470 (includes Gold speaker binding posts, 3 year parts and labor warranty and full cleaning) + shipping.



    IEC socket: $40.00

    M500 power switch (added to back of unit): $40

    Other Options:

    Restore without mkII upgrade (stock specs, new LEDs): $350.00 + shipping

    Restore with new binding posts: $395.00 + shipping

    • Like 2

    User Feedback

    Recommended Comments

    I have two M500t amps, and had both restored by someone I found on eBay.  I had major/minor problems with both, so I sent them to Greg to look at.  Greg opened them and sent me photos of what he found, and it's clear that someone who does not know electronics can be taken advantage of, as I was to some degree. 

    So, bite the bullet and get your amp done right, by Greg, the first time.  You'll save yourself a lot of time and money.  Looking at the attached "before and after" photo, even to my inexperienced eye I can clearly see the difference between the "'eBay build" and Greg's workmanship. 

    The amps sound fantastic, and I look forward to many years of enjoyment with them. 


    • Like 1
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    On 12/17/2022 at 10:25 PM, Guest Bob E said:

    Are you still doing these upgrades? Also can you calibrate meters mine seem to be off one reads more than the other?



    Yes of course we are still doing these mods. We always calibrate the meters when serviced.

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    What are the power specs after the restore and mod on the m500 and the cost I have one I'm thinking about having it serviced soon.

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    10 hours ago, Guest M500 said:

    What are the power specs after the restore and mod on the m500 and the cost I have one I'm thinking about having it serviced soon.

    That information is above.

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