2. amps-preamps
  3. 181722-96

Don’t buy used McCormack DNA 1990s amps

This is a public service announcement.  There are some yahoos on other sites selling 1990s McCormack DNA amps, sometimes at ridiculous prices.  While they’re great amps, and I happily owned a DNA 0.5 RevA for 20 years, they’re all gonna fatally fail.  Why?  Because their input board is at the end of its useful life, and when it fails your amp is dead and not repairable by anyone — not even SMcAudio.  It’s a boat anchor.  The only option is to sell it for scraps or get an SMcAudio upgrade that’ll cost around $2000.  Given my love of my amp I chose to do full upgrades given what else I could’ve gotten for the same same price and just got it back and will forward thoughts if anyone cares.  But the purpose of this post is to warn off any prospective buyers of a circa 1990s DNA amp that it’ll fatally fail soon, so unless you get a great price and plan on doing the SMcAudio upgrades just avoid these amps on the used market.  You’ve been warned. 

soix
kchamber
9 posts
 

@davidbeagrace 

CJ is still working on the DNA amps. When I contacted them a couple months back for schematics they offered to upgrade and rebuild the DNA1 I was working on. Here's an excerpt from that email.

"The only repair/update we offer is the R1 main board replacement.
At the same time the amp components are upgraded to the Deluxe level.
The price is $1050 plus shipping for the R1 board replacement.
This is a 25-30 year old amp.
Also the main power supply capacitors have reached their time limits, 20-30 years is normal.
The insulation deteriorates over time, as a result there is more
internal resistance. The resistance causes heat, the heat causes the deterioration to accelerate.
Many times the metal can expands as pressure inside builds up.
There are 16 capacitors in the main power supply.
The supply capacitors replaced at the same time is recommended, and adds another $550.
Replacing the caps would normally have 3hrs labor charges.
However I'll waive the labor for the cap replacement if done with the upgrade, since some of the labor is duplicated.
So around $1600 total, plus box and packing and shipping"

 

However we didn't go that route so I cannot attest to the work they perform, but at least you know the cost.

soix OP
9,789 posts
 

@kchamber Thanks for sharing this valuable info!

jetter
3,052 posts
 

@kchamber Just a bit of curiosity.  You mention in your post above that you did not go the $1,600 route, but that CJ is working on your amps.  Do you mind mentioning what route CJ is taking in updating your amps?

kchamber
9 posts
 

@jetter 

Sorry I should've been more clear on that. What I meant is that CJ is still repairing and restoring amps that are sent to them. I only contacted CJ for schematics and they offered a full rebuild in response. For my own DNA1 amp and another unit brought to me by a local audiophile, I've done the repairs and upgrades myself.

jetter
3,052 posts
 

@kchamber Ah, I see, thanks for the clarification.

Was the repair you performed on the "self destructing" motherboard that was more or less the subject of this OP or something else?

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