About 15 years ago, I picked up this NAC 42. I’m missing the power amp, so I never have powered it up.
I recently decided to take a look at this and figure it out. The rear tag lists the model as “NAC XO”. It also appears there the is a sticker over the original connection chart. Wondering if this was upgraded at some point? Here’s some pics - I think it has MM phono boards.
It may well have started out as a NAC42XO but it must have been converted back to a regular NAC42 (actually looks like a NAC42.5) at some point, with a new main board too by the looks of it.
Here’s what a NAC42XO would have looked like inside;
I’m assuming this would have been partnered with a pair of 110s / 140s at the time (which would also provide power to the 42XO) ? Any ideas on typical speaker partnering combinations at the time - Naim, ARC, Linn etc ?
I don’t know the numbers, but I don’t think there were that many. And of course a good number would have been converted to regular NAC42/42.5s in later years.
Making some progress. Hooked up a laboratory power supply and various jumpers to get signal in and out. Changed the BNC on the phono inputs to RCA.
Did some testing with CD and vinyl. Sounded pretty darn good with cd. Vinyl was OK, but I’m using a new cart which I don’t have a handle on. The Vintage Sony amp is also a bit of a wildcard. Late 80s vintage (recapped). I haven’t used it in a system before. Thinking about moving this system downstairs and giving the Marantz a break.