1970's receivers and integrated amps...

In the early 70s I worked in an audio store. We fixed, tested and sold receivers. We had a test bench and we gave each customer a hard copy of their unit's performance versus specifications for power output, THD and IM. We included a Polariod photo of a 20KHz square wave, to show the unit's bandwidth.

Many units we tested didn't make their specs. Exceptions were Harman-Kardon and Marantz, which often did noticeably better than spec, and Yamaha which just made it.

I quit working in audio before the end of the decade, but friends who didn't told me that by 1980, the poor-performing makes had gotten a lot better.

The better ones (like Tandberg, Sansui, Nikko, Sony, Marantz, Yamaha, Onkyo, Kenwood and Pioneer) can sound very good if in good working order, in a well set up system, and used with the right speaker setup.

Their weak point in general will be current delivery in that power supplies in most receivers and integrated amps do not match up to those in separates. This can be a handicap when used with many modern speaker designs that are harder to drive optimally.

The deficiencies will often be noticed in the bass. Use of a good powered sub to offload the bass can be an effective solution to help deliver top notch performance.

It can be hit or miss about the absolute sound quality of some of these products. And as others have said you have to make sure they are in proper working order. Craigslist is an excellent source of these products. You can find them for under $100, throw another $100 in for cleaning and repairs and you'll end up with a very workable second or third system amp.

That said, at best the amps sound okay to good. One thing that is indisputable is that the tuner sections are excellent and easily keep up with best of modern tuners.

tandberg, mac,revox, kyrocera, marantz, hk, nad, and others made some sweet stuff. condition is everything today.

But God are they BEAUTIFUL!!!