I don't think that was such a good deal but as long as you are happy, that's what matters.

My reasoning is a 48 wpc Pioneer would not be considered "high end", even though it is Quad. To enjoy Quad, you'd have to have all the source components and software (ie. LP).For not much more than what you spent, you can buy Jolida or Marantz integrated.which I'd think could out perform the Pioneer. You can buy a pretty good HT receiver these days for that money too. I could have bought a McIntosh receiver for $400.00. I got a Luxman which is far better than the Pioneer for the original $90.00.

Not all old stereo gear is quality vintage, it's just old.

As an example I bought an old Sansui receiver for my brother, he eventually replaced that with the Luxman I was talking about, but the Sansui receiver was garbage compared to the Sansui AU-9500 I have. The receiver, just an old receiver, the 9500, a gem, and would be worth putting a couple hundred into for recapping. But for now it's working fine.