By the mid-eighties, Marantz had a problem. The CD-63 was landing in living rooms across Europe and sounding genuinely musical — warm, detailed, not the brittle laser-disc-player-for-audio that most people expected from early digital. But if you plugged it into the wrong amplifier, all that careful voicing went sideways. You'd end up with something bright, thin, and clinical. Marantz knew this. So they built the PM-66.
Released in 1986 and aimed squarely at the European market, the PM-66 was positioned as the integrated half of what Marantz considered a natural system. Pair it with the CD-63, run it through a set of bookshelf speakers, and you had something coherent — a full chain of components speaking the same musical language. That's not marketing fluff. It's audible.
The PM-66 puts out a modest 45 watts per channel into 8 ohms, which sounds underwhelming until you actually sit in front of it. Marantz used a dual-mono topology through most of the signal path, which pays real dividends in stereo separation. The power supply is more substantial than the price tag suggests — they clearly didn't want the amp sagging on transients and ruining what the CD-63 had done upstream. The output stage is Class AB, but the bias is set on the warmer end, which is part of why people keep describing this amp as "tube-like" even though there's nothing tubed about it.
What You Actually Hear
It's smooth. Not rolled-off, not euphonically blurry, but genuinely smooth in the way that lets you listen for three hours without fatigue. The midrange is where the PM-66 earns its reputation — voices sit forward in the mix with just the right amount of weight, and acoustic instruments have texture rather than just frequency. The high end is present but never aggressive. The bass isn't thunderous, but it's defined.
This is exactly the amp you want behind a CD-63, a Thorens TD-160, or a Rega Planar 2 with a half-decent Goldring. It doesn't editorialize. It doesn't try to impress you with its detail retrieval. It just plays music.
There's a phono stage built in — moving magnet only, but it's respectable, and it's another indicator that Marantz was building this for people who still had turntables in 1986, which was most of us. The headphone output works and sounds decent, which was not a given at this price.
Now for the honest caveat: the PM-66 can run warm. Not dangerously warm, but warm enough that you want ventilation above it, and the older ones sometimes develop a small amount of channel imbalance as the volume pot ages. A contact cleaner and a few turns of the pot usually handles it, but if you're buying one and it sounds slightly off-center at low volumes, that's the first place to look before you start assuming something's seriously wrong.
Also, and I say this as someone who loves this amp: it's not going to embarrass a Naim or a Creek from the same era on technical grounds. But it costs a third of the price on a good eBay day, and it sounds like it costs significantly more.
The PM-66 is the kind of amp that audiophiles who are chasing specs keep overlooking, and the kind that people who actually love music keep quietly recommending to each other. There's a difference between those two groups, and the PM-66 has figured out which one it belongs to.