some 70's and 80's receivers seem to be popular


Is this just nostalgia? I thought the concensus was that even the best solid state during that era was harsh and hard to listen to for long. That is certainly my memory. I almost quit listening to the stereo back then, until I got tube amplification and realized what the problem had been (well, having been suckered into switching to cd's was also part of it). But now some of that equipment seems to attract fans and bidders. Are they just dreaming?
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I highly recommend you pick up a 70's 22XX Marantz Receiver in good working order and you will find out how good they sound. (I have the 2218 model. Very Musical) I also own a Sony VX-5 receiver which I modified w/new power cord/binding posts/a high quality power rocker switch. You would be amazed how good it sounds. Exc. phono and FM tuners in these Receivers.
My brother has vintage a Marantz 250 power amp and 3300 preamp driving Paradigm Titans. His digital source is a Bose wave radio. What I thought was going to be an old mans "dream system" sounded detailed yet musical with no fatigue. He did have both pieces recapped and cleaned. Total system cost was about $1500. Sherod is correct about the lack of negative feedback. Check specs on the early 70's Marantz components...distortion is relatively high. The Marantz 2270 I have shelved in the closet will become my new "second" system after coming back from the audio doc!
The brands mentioned above were/are very good.

I've owned Tandberg and Yamaha in recent years and both have delivered the sonic goods in my second, two channel A/V system.

The Advent 300 was another very good sounding though finicky piece.
If you do find a good-sounding vintage receiver, i.e Marantz 22xx series, if it is original and never been serviced, I highly recommend you take it to a good Tech and have them upgrade(replace) certain caps and give it a thorough cleaning and bench test. Most caps that are 20 years and older could possibly be leaking and/or on their way out. This will give you not only peace of mind but a better sounding receiver with many more years of happy listening.