Conrad Johnson Owners.com

Thanks admin,

I really love the recapped Mccormack DNA-1 (have three two deluxe and one Rev.A), Krell recapped KRC-3 preamp (have two), 300cd (have two) and ML Vantage. Amazing high end sound system within low budget. Besides I can modify and recap those units. Beside my EE main job, I am think of ...

Since I own the first Mccormack DNA-1 last year now I have own three of them. The first was standard DNA-1 and had recapped in Nov 2024 then upgraded to Deluxe version. Then I bought a Deluxe version for cheap $300 none working. I fixed it with original/better parts and recapped all. Next step for ...

Just updating that the DNA-1 deluxe is working well as still break-in. I just hook it up to old Bose 501. My friend from Europe told me it needs more than 150 hours to get the great sound of the best capacitor loops. Amazingly that I have chance to witness the sound improve every 4-5 hours. This ...

Hello,

It’s been long for my Mccormack DNA-1 recap since last Jul. Now I have 3 of DNA-1 units. I bought one Deluxe as none working but it’s very cheap. With spending nights and days, order parts, a lot of proper soldering steps, plus with helps from a friend from Europe, I just fixed it with all ...

I would be surprised if they are still selling the original OEM transformer.

Maybe trying to find something here that matches the specs: https://toroid.com They also do custom transformers but have no idea how much that would cost?


I called them to ask for the custom toroidal but no luck yet ...

Hello Admin and All,

Do you know where I can custom order the Toroidal transformer for Mccormack DNA1? It is117V input and multiple outputs (dual 60V. Dual 18V, dual 40V and dual 30V).

Thanks admin and AnotherJohnson. I will start to rebuild it tonight. I think I will slowly / carefully finish it within 1 week. I have all the capacitors, wires and document.

Chan

I read extra forums where DNA-1 end users received suggestions from Steve and Pat. I can resume here:

1. The original DNA-1 driver PCB had built with laminated and thin upper and lower circuits that the through holes of uppper and lower sides of laminate would separated that led to open circuit ...

What I meant the cooling pads were those insulation adhesives between the power output transistors and cooling heatsink to separate the connections with the cooling chassis and GND.

https://a.co/d/04qxM6T4

I sent the schematic to the email.

I have IR thermometer. I will check it.

I also contacted Steve and Pat from Mccormack. Pat is guiding me checking around the simple steps before going further upgrade.

Abosutely the recapping is needed to get it last longer.
Chan

I ordered all Nichicon capacitors and ready to do recaps.

My question is my DNA-1 poweramp is still working very well. Sound perfectly with original input board and power amp output board. It is only real hotter than before. A friend of mine suggested to add cool pads and cooling fan on the unit to ...

Hello @Admin, I found the schematic for original DNA-1. How can I send it to you? The file is BMP with 22M size that can’t attach here.

I am on business trip for my main job for two weeks. I ordered the capacitors already. Sure I will update the status.

Chan

Thanks admin.

I bought a good price DNA-1 few year ago for just $800. It is still good but I think it is time to recap and upgrade all ground cabls, input cables/terminals.

I research some suppliers that they carry electrolytic capacitors, resistors. I am EE with repair experience in fixing ...

Hi Auriian,

I am planning to DIY recap and replace all needed lytics, gounding and rear inputs dor my DNA 1. Could you please suggest me where I can order thoses needed stuffs? I have small work bench which have all soldering, scope, VOM, etc

Thanks in advanced,
Chan