This NAD 2200 is still going very well as are 5 of my 6.
I have my main system tri-amped with 3 NAD 2200's (one running bridged mono @8 ohm's for each of 2 Dahlquist M-905's [a 6 ohm load] and 1 running stereo @ 4 ohm's to each of my 2 custom {by me} 4 ohm subs).
The 1 that is not going at this time suffered a giant power surge (from an exploding transformer on the telephone pole outside, the flash INSIDE my house house made momentary shadows on the walls INSIDE my home that also killed the 1350 watt UPS that it's power cord was plugged up to).
I have the amps on their own circuits in the home (there was a small black mark at the power outlet that the UPS plugged into but the 20 amp breaker was not tripped & the circuit tested fine. But I replaced the outlet anyway).
This 1 UPS & the 1 NAD were the only thing damaged in the 3 NAD 2200 system (reminder: each is on it's own 20 amp circuit).
Fortunately Peter (of Quirk Audio [which refurbishes a range of products from companies such as APT Holman, Harmon Kardon, Grommes, Fisher, Kenwood, Marantz, McIntosh, Mitsubishi, NAD, Nakamichi, Onkyo, Pioneer, Revox, Sansui and many others, including both tube and solid state units]. By selecting those products and designs that will reward upgrading and refurbishing, where new components, which as technology has evolved, are often greatly superior to the originals, can be installed, resulting in quite outstanding performance, which otherwise today is only available at the highest echelons, and cost, of specialist audio equipment, allowing one to have a GREAT vintage/classic product in your system),
had one of my other NAD 2200's in for servicing (I send them for general servicing & inspection about every 5 years or so), prioritized getting it finished for me & sent it back to me poste haste so that I could just pull the messed up one out of that system & put the newly serviced one into it's place.
Thank you Peter!
As far as the holes on the top of the case being only over one of the internal heatsinks, I don't think it has much of an affect as the amp creates almost no heat at all at any ambient temp or usage.
